I just got this player today, but I already have it set up with all my music and all my favorite Apps. So far everything is working great! I use the Google Music Player, and it works very well. I use it on all my other devices, and I really like it. Also, you should be able to use your Google Play Lists. I have totally customized the look with my wallpaper and Widgets on the home screen. I have a J3, so I knew the sound would be great. I am a real Android fan, so this is very familiar to me. A few days ago I bought an iPod Touch - 64GB. It looked good, but the sound quality really sucked compared to my J3. Also the lock screen, and inability to customize drove me nuts. I took it back the next day and ordered the Z2. The only thing that worries me is how hot it gets. I worry about the battery life.
I am going to have so much fun customizing this thing!!!