Reviews are not possible for obvious reasons. I have owned for awhile and upgraded once my Sonos system. The app is crap. They have since reduced functionality/sound controls, I constantly have issues with the app. Crashing It requires constant reboots, too many updates for less service, now recently and final straw it is requiring an update that is dead end. No fix offered and I am not here to waste more time with sonos tech support  Error message says retry later with no options to fix and zero functionality. I now know I paid wayyyyy too much for this garbage company's junk product. Replacement systems they offer cost stupid money for crap app and only fair to good speakers. Buy it if you want speakers that forever increase in costs and headaches. I want my money back and damages. It's like buying shoes and the soles soon fall off in a sharp rock pavement.