I've been using my Nexus 7 for several weeks now. I still think Android has a way to go in the UI/UX area but it seems a lot better in Jelly Bean compared to older versions of Android I have tried.

However, the number one feature I wish I had on my iPhone is the Android intents system. It is seriously great. I'd love to be able to set the default application for different actions. When I tell my Nexus 7 to play a particular song it will now launch Spotify to play the song I requested. I should be able to do this with Siri. This would be a huge feature for me.