> Sonos sounds great, has nice features and "just works".

Perhaps not for long, if you do not accept their take-it-or-leave-it terms. Personally, I don't mind not accepting the TOS and simply leaving my software in the state that it currently is in, forever. My device is currently working acceptably, so I don't see why I need an update. But if they're saying it's going to eventually stop working, that's where any sane person should draw the line.