A:Answer Not sure which Optimum Cable modem you had before or the one you are paying $50 , I have been running the same DOCSIS 3 "Arris" Optimum cable modem for 5 years+ and recently upgraded to a 3 pack of EERO pro (newest gen) and had 0 issues
Also, if you are a power user or have many devices/family members, I recommend eero PRO (latest gen) not the Eero
The biggest change was eero set my internal ip scheme to 192.168.4.X
BTW, Cablevision was sending out these DOCSIS 3 modems for free YEARS ago, and of course you have to rent it, if you want to purchase you own ARRIS TM1602A, you can, but you'll have to call them so get it authorized
Even if you were running a non mesh router, you'd have issues with speed and uptime if you didn't have docsis 3.....