Been using the app a while now. Tested on iPhone 4 and the new iPad.
Overall I'd only give this app 2-3 stars. The app itself looks amazing. I love the whole design. Especially the reel-to-reel player and sleep timer. However I find the app extremely buggy. Very unresponsive. And takes a long time to load thumbnails. All of the previous apps that Apple have released have worked flawlessly for me. Without one single problem. Think they shoulda tested this one for a longer amount of time and made it perfect. Like their others. Still I'm sure they'll improve the performance in a future update. And make it perfect like they always do