I cancelled my order, the battery does fit but then the replacement back to go with the battery doesn't. Hopefully Samsung will put this kit out for the AT&T version .
I got this battery with a dock charger and it works fine but when I plug it in to anything (computer/usb or power/usb) it freezes the phone and makes it cycle the battery charging/phone off symbol while the battery(?) makes a very quiet clicky sound. Not good. So I started charging it on the dock (came with a spare battery charging slot) and carrying it as an extra. It works fine, just don't charge your precious AT&T Galaxy S2 with it.
I did the shot at this angle so you could see the contacts, I saw some mention of it. My bad on the upside-down hah.