Just got a pair of the overalls. I dig em, but there are a few things I do dislike. I don't like the strap clasps. They use the Carhart style clasp that has the 90* lock. I don't like this style. I rather have the Dickie style where the little hoops fits over the button and snaps together. The button style does not tend to pull on the material as hard and resists ripping.
I got the Ultimate model. I also have the Ultimate pants. But the two fabrics are different - the pants are much thicker. Aside from that, the pants have double knees and the pocket for knee pads, and the tool belt loops. The overalls did not have these features. I was a bit bummed.
The fit, though, is great. I dig the extra ball room. I may wear these shirtless when I go to the mall.