On my Nexus S - 2.3.3, it upgraded my stock music app, and I gotta say, so far...I'm not impressed! I already hated the way the background changes color in the stock gallery app, and this thing does the same thing, it just seems unnecessary. Google should definitely add an option to change that. I haven't found a way to get that 3D side-scrolling album view. Also, how do you edit the tracks in the play-queue? Old player and pretty much every other player on the market gives you that option! - this is the main reason I deleted Amazon Cloud player, no way to edit the play queue.