I just purchased a 2015 crew cab z71 v6 model.
So far I really like it. I've always owned v8 vehicle and this v6 really surprised me, really has a lot of get up and go. I haven't had the chance to tow with it yet, but I'm really curious to see how it does. One thing I'm definitely having to get used to is the 6 speed auto transmission. I've always owned vehicles with 4 speed autos, but its slowly growing on me.
As for comfort, I find it very comfortable. Mine has the leather heated seats which are pretty comfortable. I really like the look and style of them. They seem to remind me off the newer ss camaro seats. I'm only 5'9, but since I purchases a new truck we seem to take mine to lunch at work and several of the guys are roughly 6 ft tall and ride in the backseat and claim there is plenty of room, more "roomy" then they had expected.
One complaint I've read about that I can somewhat agree with is the door pockets, theres storage pockets there, but almost impossible to access unless the door is open. But I'm not that critical so it doesn't bother me to much. So far I have 3k miles on mine and love it. Tomorrow I'm taking it on roughly a 4-500 mile one way trip, or about 1k mile round trip in a total of a day in a half, so ill be able to give a better opinion as far as comfort goes.