The UI: The UI is very easy to navigate and the screen looks great. I only have two complaints, the touch screen sometimes has trouble telling when I am swiping and scrolling, and the screen sometimes pulses when navigating the UI.    Sound quality: My IEMs sound great. The Zune also manages to drive my Denon D5000 satisfactorily though an amp is definitely needed for any high quality cans.    Apps: The apps market is pretty weak though with a total of 30 apps or so. However, Facebook and Twitter apps are available which should be...