So I know lots of posts, but from people that have them what are the pros and cons of the Iphone?

I have a Samsung Blackjack, and played with the Iphone for the first time yesterday. I loved it, but then again when I first got my Blackjack I loved it also. The easy texting, internet at my fingertips. So I want to know from people that have them what they like and don't like from their Iphones...