Yea they look really nice...its the Samsung Galaxy S, which is slightly different for several carriers. Its also on AT&T right, Sprint and so forth later. The Sprint model has 4G capability (nice if you are in a coverage area...not so nice if you aren't since you have to pay for it anyway) and a physical keypad.
I looked at the T-mobile Vibrant the other day; it looks fantastic. Sweet is right. No physical keypad, though, it does have the swipe thing for typing. I remember reading on online review which pointed to the GPS reception as a possible weak point for that phone compared to the others, but it seemed to work fine in the store.