Ronin12,
I have been using an unlocked one since it was launched on AT&T. I love it! The only minor set back is obviously it's locked on the EDGE network, since it doesn't have the AT&T 3G radio.
For me, not really an issue! I use the wifi around the house, and for the short amount of time I'm at my office I also use the wifi there as well.
Seriously, I find the internet over EDGE not terrible. Since almost all websites have mobile sites, it helps the loading of pages acceptable for me!
Now, if we are talking about streaming video & gaming, it's obvious not going to work worth a darn!
Hopefully AT&T will get there version soon, then I'll decide about switching devices.
Good Luck!