Z2 vs. J3?

[rikc]

Cracked the screen on my J3 after two years of faithful service Saw the Z2 and it looks neat, so I'm considering upgrading.

All of the reviews I see for the Z2 tend to compare it to ipods and their UI, but I'm curious how the Android interface feels to longtime Cowon owners. The J3 is my favorite MP3 player I've owned and I've gotten used to the interface and the side buttons (which I love). So a few specific questions:

- How does the Android UI compare to the J3 UI? (I didn't use any custom mods on my J3)

- How are the side buttons? I use them an awful lot on my J3, is it still pretty easy to navigate "blind?" Does that play/pause button make things more difficult?

Thanks for any advice!