Customer Ratings & Reviews

The Shark Cordless Clean and Empty (BU3521) is a light weight and easy to use stick, cordless vacuum system that features a rechargeable battery and a runtime of approximately 40 minutes which is sufficient for my approximately 2000 square foot house consisting of both rugs and hardwood floors. In addition to being able to clean floors, the handheld vacuum can be detached so that furniture, curtains, and other above floor areas can be vacuumed. It comes with a quick setup guide so that you are up and running within minutes. As mentioned above, the BU3521 is great for vacuuming both carpet and floors and auto adjusts to different floor types. Frequent emptying is not required since the auto emptying base provides up to 30 days of storage. Also the auto emptying dock charges and empties your vacuum. Additional features are a self cleaning brushroll and a HEPA filtration. If you are looking for a compact, high quality, lightweight cordless vacuum system with great features like auto base emptying and charging, cleaning flexibility and the power of a more traditional cordless vacuum, I recommend the Shark BU3521.

The Shark-Clean & Empty Cordless Stick Vacuum is great. It was beyond easy to put together. It did not take long to become fully charged, and it works amazingly well. Right out of the box, all you have to do is snap together the pieces, this is super easy to do. Once you have them together. Find a good spot in your house for the docking station, and place the stick vacuum on it for a few hours for it to become fully charged. Once it is fully charged you can begin to vacuum. It has a very neat feature where it automatically detects the area rugs in our house and the brush/suction power increase. It does have a boost option it seems to work very well. While the dust bin on the vacuum itself is not very big, all you have to do is walk over to the docking station and place it on the dock and it will empty itself out. No more getting dust on the floor, or on the rim of the trashcan when emptying the dust bin. Overall this vacuum is amazing and I'm very happy with it's performance. It's a great vacuum and easy to use.

Returned same day, before opening. Not what I wanted.

This has become my favorite cleaner. I love watching all the technology changes over the years. The first vacuum I remember was my mother’s old Hoover. It was huge, weighed a ton, and was so loud it scared the cats on the next block, this one would not disturb their naps. The Sharp Clean & Empty is lightweight, works beautifully both on bare floors and carpeting, and the ‘self emptying’ feature works really well. The most important requirement of any vacuum cleaner of course is how well it works, how it cleans your floors. As lightweight as it is, I bet this cleans as well or better than my mother’s old Hoover. As you go from bare floors to carpet, you can hear the motor speed change and the LED on the head goes from blue to magenta as it hits carpeting. Also, I hardly ever had to go over any debris on the floor more than once. I also was delighted that more than any other cleaner I’ve used; this one was GREAT against a wall or other object. Usually, I’ve had to bend down and move a crumb or something away from the wall, this machine sucked it right up. I also liked the FOURTEEN LEDs on the head which really lights up the floor which is perfect in a dark part of your room. For those with allergies, the HEPA filter keeps the dust in the cleaner, it doesn’t blow it out in your room. But the most fun is watching the self-emptying feature work. It’s all automatic. Every time you place the cleaner back on its stand, you watch it automatically flushing out every bit of dirt in its receptacle. When the large dust bin in the stand finally fills up, you just lift it by the handle, push the button and watch all the debris fall into the trash. There’s no bag needed. Also the stand is very sturdy. I’ve had cleaners with stands which tend to topple easily. Maybe because of the large dust receptacle at the base of this stand, no worries about that. Bottom line, this is a great vacuum cleaner, lightweight powerful, does all it should, and the self emptying feature is just the icing on the cake.

We have two pomeranians and three cats and so we have a lot of fur and dander to sweep up. This comes at us both on the floor and in areas that we cannot easily reach. This new vacuum is easily able to accomplish both jobs and is an incredible piece of technology, fitting right in your hands and I really just do not know how they were able to do this. I think we are at the point where Shark is outperforming Dyson in some ways, while charging less for a comparable product. Getting a new vacuum can mean a plethora of parts, instructions and assembly. Thankfully this machine is about 95% configured, with just a couple of parts to snap into one another. You really don't even have to look at the instruction manual, but you probably should. After a few minutes of setup the unit that I had was already charged and ready to go. So off I went, first with the shorter hand carried vac sweeping up the stairs. Next was the full vacuum and there was plenty to sweep up in our main hallway, where we all walk the most. It was obvious that the vacuum was really getting a lot of hair as you can plainly see it fly up through, and into, the tube. This is fascinating to watch, but also shows you very clearly when, and if, the vacuum is not really picking up correctly, indicating a potential choke spot in the vacuum that needs to be cleared. We have an incredible amount of suction on this vacuum, and yet somehow it is still incredibly light. It's a full vacuum that is akin to picking up a stick vacuum, so it's really a major feat to be able to get that kind of suction and portability. All in all Shark has won me over. This vacuum is all you will need, save for perhaps a wet vaccum, for us pet owners. I could not be happier with it's overall ease of use, lightweight and suction power. Highly recommended!

I have so many shark products and they have done well over the years. I love the fact that they put the handheld vacuum and floor vacuum in one! I have a small amount of carpet in my house, but my floor stay extremely dusty mainly because of the vents need cleaning. I use this vacuum throughout the upstairs, downstairs, and on the stairs leading into the basement. I mostly use the attachments on the stairs because they are carpet and a little bit harder to vacuum. Most people never think to use a vacuum to get up dirt off of your floor, but trust me, this is so much easier to use than most would think on a hard surface floor! This vacuum really gets up more dirt than your average broom when you're constantly pulling the dustpan back trying to sweep more dirt into it, but there's always a little line that you can't get. Not any longer, with this vacuum, you really don't have to worry about any dust or dirt on the floor! I really could care less about emptying out the contents of the vacuum in the garbage can, until I didn't have to do it anymore. Now I wonder why this hasn't been been on every vacuum lol. Have use the handheld part of the vacuum to clean out my vehicles. It really does have nice suction power, and it last almost as long as it takes me to vacuum both cars. My only complaint, is that it would be nice if the vacuum came with an attachment that would get in the corners in along the baseboards! Whoever comes up with an invention like that, would sell a whole Lotta vacuums!

So far we have absolutely loved the Shark Clean and Empty stick Vacuum with the Auto Empty compartment. my husband fought for ages on weather we wanted it for our personal house or our vacation rental. The vacation rental won and we have been so happy with our decision. The vacuum works just like every other shark stick vacuum. It picks up things you wouldn't expect and auto changes to the setting you need it for. The Shark works great on both hard tile floor as well as the rugs we have scattered around the house. I am able to clean the whole 1000sq foot home on 1 charge. Then you just place it on the docking base and it sucks out all the debris from the vacuum. on top of it sucking out all the debris from the vacuum it also charges it on the base. This means no more fumbling with cords and tiny holes. The base compartment is not the easiest to get off, cleaned, and back on. But when you only have to do it once a month, I can handle it. the base has a spot for 1 of the accessories (why not both?? not sure) All in All this is my favorite vacuum!

Vacuum works as expected. Suction on carpet a bit weak but acceptable for a cordless. Only complaint is a minor issue regarding storage for accessories. There is a storage spot for the crevice tool but not for the mini brush so we rest it on a small shelf on the charging base. Too soon to tell longevity since its only a few weeks old and we have not emptied the main dirt collector yet

This is a fantastic little unit for daily clean-ups. It is small enough to conveniently store away (and not be in the way), but powerful enough to get up the daily messes. I use it regularly to clean up in the kitchen, dining, living, and common spaces. The power brush works well (the built-in LED lighting in the power brush is a plus) and it is small and very maneuverable. I particularly like that docking the unit not only charges the cordless vacuum, but it also triggers the base unit to vacuum out the dust collected in the cordless broom. Very simple and very cool. I usually run the unit with the standard power / suction level, but will hit the 'turbo' button from time-to-time to get additional suction power. The standard power works well for most situations, but the turbo definitely gives it a boost. My only negative point is that the unit draws power quickly in the turbo mode (a slightly longer duration battery would have been a plus). Overall, the unit provides all the power and duration that I need for daily cleanups. It is light enough, but powerful enough to make cleanup easy. I highly recommend this unit.

I tried it for a week at this big afterparty and it cleaned up SMOOTHHHHH