:agree2:There are no issues specific to the '07s that I'm aware of, that don't relate to any other 3rd gen.
I've got 37,000 miles on mine, so far I've had the driver's seat foam replaced (search around, you'll find more than you care to read on the crummy seats in these trucks), and I had a water leak in the cab.
Both issues were fixed under warranty.
Other than that its been a solid truck. I'm not overly impressed with the quality of materials and the fit & finish of the interior but other than that, its been fine.
Can't tell you about the G56, as I have an auto.