It will be nice if the MMS does roll out on Friday. I recently switched to the iPhone 3GS from a Samsung Blackjack II and I have been impressed by the iPhone. I was paying the same for service so I figured I would go with the iPhone since I was due for an upgrade.
It does suck at the moment not to be able to take a picture and send it to a friend but I can email the photo pretty quick from the phone so that is a plus.
I just hope the network doesn't grind to a halt with everyone with an iPhone testing out the MMS capability on Friday!