The iPhone is pretty slick. I mainly use my smartphone for email so for years I've been partial to BlackBerry.
A few months ago our contract came up and my wife and I upgraded. I went for the newest and best Blackberry and absolutely hated it. I tried to like it, but the interface was clunky and counter-intuitive. Some of the hardware buttons changed what they did from previous releases and while it had a touch screen, it couldn't decide on how it wanted you to input.
Sometimes you needed to click on something on screen, other times you'd be typing using the keyboard and then need to press a hardware button to continue.
Eventually I just returned it and got a new iPhone. I'm pretty pleased with it. I don't like how they try to "protect" you from using the free space as storage like a memory stick, but meh, not a major concern.