A:AnswerIt's 5" long and 2 3/4" wide at the top and bottom. The middle is 2 1/4" as it curves in towards the middle. A small hand would fit this mouse no problem.
A:AnswerHas a grippy mat finish on the top that feels on the lines of rubber. Has also grips on the sides which they added to replace the glossy plastic from previous deathadders.
A:AnswerAlthough I don't have an Alienware I do know that Razer Synapse (the software downloaded for free that controls the customization) can be downloaded on anything Windows.
A:AnswerDepends. If you got the Geek Squad protection - Best Buy. If you didn't and it's still under warranty - contact Razer. If you don't fall under both of those, I'd still try contacting Razer. If it's a defect in craftsmanship or just stops working, Razer should be able to do something for you. Just make sure you registered your mouse on their website.