I started with an N1 and later got an iPad 2. I found I had to turn off all push notifications and was surprised that apple would put out something that had such inferior usability when the notification dropdown thing that Android has is so clearly better. Maybe they didn't want to copy the people they despised? Or maybe they just couldn't find the engineering time until 5.0? I dunno. It was unbearable. I had to turn all of the push notifications off because I just couldn't handle being interrupted by a modal dialog all the time.

The other thing that really stinks on the iPad compared to the N1 is the non-multi-tasking of apps. Everytime I switch to a different app it starts all over again... Really? Really.

In general iOS was really pretty, and really usable. Maybe I was just aculturated to the android way of handling multi-tasking and notifications, but those two things alone made me think, "I can't believe people put up with this stuff..." :)