I'm coming From an iPhone 3G...my biggest complaint is the browsing experience..and this is prly a software thing or just my total inexperience with android...but i just can't figure out how to get the text bigger and still fit to the page nicely...the iPhone is much better in that aspect.
Wifi- it is struggling with a bunch of routers...I kept dropping a connection till I changed from wpa2 to wpa...no big deal now but was a day of frustration.
Email client- could not send through hotmail...till I got maildroid two days of frustration...it's hard to switch when you've used the same address for ten years.
I had an issue while making calls...my face hit keypad and I was hitting keys...can you lock the screen during phone calls?
I'm not in love with the hard buttons, but not a huge issue.
I do not like the Facebook contact issue.
I'm actually impressed with speakerphone and volume in general...it blows my iPhone out of the water. I'm going to have a steep learning curve but having a device that actually can make and receive calls is pretty cool
I also like delete all in email!!! iPhone didn't have that.
If reception tests out to be better than AT+T, I'll deal with some other frustrations.