I have one.

My plan is the 900 minute plan and unlimited data, and 200 test messages.

With tax it's about $110.00 a month. That's how Apple reduced the prices of the phone, they increased the plans which Apple get a percentage of.

I love it, I'm not in a 3G area at the moment and when I am it's superfast. When I'm on the edge network speed is definitely lacking, so check that out.

Ipod works great on, beautiful video, and ton of apps to load.

I highly recommend, I'm not sure about the share plans with the Iphone though??

Sprint now with there Iphone competitor and there $99.00 unlimited plan sounds pretty good though.
I purchased the 16gb model for $249.00 and have no regrets.