I just got one 2 days ago and am wondering what took me so long! It is really easy to use - my 3 year old can manuever around in it to find Angry Birds LOL. The internet is much faster than my old Blackberry. The touch screen is really responsive. My DH has a Droid, and I always had a tough time trying to text from his phone, kept hitting the wrong letter and such. I never thought I would buy an iPhone, but after using DH's iPad, I was hooked, so now I have a mini iPad to use everywhere.
ETA: He bought me a refurbished iPhone 4 that cost $150. They retail for $650 with no contract, but I can't remember how much they would be if you upgrade to one.