I must admit I was an Iphone hater. My wife had one and I couldn't stand using the phone. I finally took the plunge after I had a falling out with sprint...
The Iphone really is a great phone. The email function alone for work is one of the easiest to use. I tried a blackberry but not being able to edit emails before you forward them on was a huge deal breaker.
After all the hype etc. the Iphone is a pretty good phone (just make sure you get a case)!
My brother has the EVO and its not to shabby but his battery life is pretty bad, that means its really bad coming from an Iphone user.