I bought a GT Grade a couple of years ago and tested it for about 100 miles. The fat tires are definitely nice and comfortable and the carbon frame was stiff as hell when I got up to pedal. But there are so many components I want to swap out that I don't know if I'll keep it. It's currently at a friend's house so he can test ride it. My main complaint about the frame is a lack of pannier rack mounts.
And flared bars - not for me. Another reason I stopped riding the GT was even after setting up the riding position to duplicate my road bike, the strange angle of the levers would make my hands go numb after about an hour of riding time. Or I'm just really used to the smaller lever hoods of my vintage Ergopower shifters. Since I want a Campy drive train, my next road bike will likely be custom.