6.1 was okay as well. 6.5 is for the faster stuff I've had the T-Mobile Wing, the T-Mobile Touch Pro 2 and now the T-Mobile HD2 (only 4 days old & it cost a pretty penny )
Wing: 201MHz
Touch Pro 2 (along with G1, MT3G, Tilt 2, MT3G Slide(600MHz), Droid, and 2 billion others): 528 MHz
HD2: 1GHz
You know that you can turn off that interface. It's an option. Go to the Today option list, hit Items, uncheck Windows Default and check Date and Messaging. There. WM6.1 homescreen.