Bought a 4X4 SR5 Double Cab in October of 2007, got about 8500 miles on her now, and couldn't be happier. Awesome truck, traded in a gutless 5.4l F-150. Wow, what a difference.
Plenty of power and great fuel economy to boot. I don't pull many heavy loads, just my bass boat that weighs about 3300 lbs. on the trailer.