I picked up my Tradesman CCSB in July of last year and drove it to the Outer Banks from Ohio a week later. I had a three in the back of ages 10, 13, and 33. I didn't hear any complaints, and I just asked the 10 year old who sat in the middle and she said it was comfortable. Now, this was an upgrade from a 2005 1500 Quad Cab that was our vacation vehicle. In fact a month earlier we had drove it up to Canada, so there was a recent comparison for them. She said it was more comfortable than the '05, which was a Big Horn, and there was certainly more room than the '05. The adult in the back was likely the least comfortable, but like I said I didn't hear any complaints.
So, that is our experience, but I guess it could depend on what the passengers are used to and how picky they are. Kids seem to deal with it better than adults.