PowerAmp does indeed work out of the box but once the devs update it with Wear support I guess we will see more pages in the pull up page on the watch where we can maybe cycle playlists, browse songs and control more functions instead of the basic skip/play/pause etc. Album art additions would be neat too
I did use it in the car for a bit as my phone is paired with the car and didn't have too much trouble. Initial pairing hiccups but I am using CyanogenMod so that was to be expected in some instances and not worth mentioning that in the review as it won't apply to most people.
I like it but initially could not see the point. only after using it a few days straight I realised what is possible once app developers start enabling Wear features. We're on the right path. I wouldn't buy a gen 1 Wear watch though, maybe Gen 2 or 3 because I can see it maturing nicely there but those who want the latest toys should certainly give it a look and at £159 it's not a huge bank breaker either.
Anything that was on the watch that had not been dealt with remains on the screen as the usual cards until you swipe them away. The icon appears top right to denote you're disconnected from a paired phone and you won't be able to do anything online until you reconnect. The Android Wear app on the phone remains in the system tray looping the notifications and Wear apps sort of like a push sync. It's Bluetooth 4.0 so doesn't consume much battery either on the local side of things.