We have a 2013 30T, bought last September. So far, we really like it, having put on about 2000 miles so far. We tow about 2000 lbs behind it, and have traversed several steep mountain passes in Colorado. It did great. I was worried about not having an engine brake, but the low gears did just fine, both up and down the passes.
It is much easier to navigate and park in state parks too, compared to what we came from, a 40' fifth wheel.
We keep it between 60 and 65 on the freeways. Not sure what the mpg is, but for the most part, the gas tank is big enough where we can travel all day without filling up. And with the lower gas prices now, MPG isnt quite as important as last summer!
We really haven't had any significant problems, just things the dealer should have fixed before we took delivery. More of a pain getting the dealer to fix it.