The most important thing for Google Play Music after the "upload your own stuff": It does a great job caching songs ahead while you're on Wifi, so you can mini

The most important thing for Google Play Music after the "upload your own stuff": It does a great job caching songs ahead while you're on Wifi, so you can minimize data usage while out and about. Plus, with the caching it also works offline perfectly well. I feel a bit sorry for all the other services, but on a technical level Google Play Music has outplayed them all entirely.