I've been an iPhone user since it's launch (currently have a 3G). The only thing I truly miss is Apple's mail app. I'm using K9 and have tried Maildroid which is very nice too but nothing is as polished as the iPhone mail app.
I'm in my 3rd week and can port my number over any time now since my contract with ATT expires today

Just waiting a few more days to decide for sure. I really do love the phone and I feel HTC sense is what Apple should have made their UI look like!
I'm just still a bit on the fence but I'm leaning heavily towards keeping the EVO. Great phone, and to my surprise great network service with Sprint. I admit I'm one of those people that just for no good reason though Sprint was a crap network. I'm admitting my preconceived notion of Sprint's service was waaay off. No dropped calls and very fast 3G in my area.