I've used bodies from a lot of different places, and heres a rundown on what I have seen. The first T I built used a Spirit body, bed, and seat insert. I liked the body, and I really liked the seat insert. Didn't care much for the bed. It didn't fit the body well, and just took a lot of work to get to the quality I wanted. This was back in 1999.
Then next I used a body from unlimited products. They aren't to far away from me, so I could drive and get it. They were such a pain in the ass to deal with. At the time they had just moved, so I kinda wrote off their lack of organization, long wait time, and general poor phone service to the hassles of moving. But the next two times I purchased from them, it was the same. The bodies are crooked, the glass thickness is inconsistant, and they are full of voids in all the corners. The car I am building now is one of these bodies. And the last one I will purchase from them.
For one of those unlimited bodies, I ordered a MAS seat insert to modify to fit. That is the nicest T bucket related fiberglass piece I have purchased. Good quality, nice and thick. The people were easy to deal with, and it came right when they said it would. I have never seen anything nice on the interent about MAS. Maybe my experience was a fluke. But I will give them another chance if the need arises.
Next, a new shop opened here a few years ago, called fat buckets. They built T bucket kits, and sold bodies from unlimited and dave koorey street rods. Two of my dad's friends bought some koorey parts unseen, but with the promise they were top quality. They were the worst parts I have seen. The body lines were terrible. the doors didn't fit right. Wavy, Just Junk. And nobody, not koorey and not fat buckets, would do anything to help. Bad parts, and bad customer service.
I used to go to a small T bucket show in Tucson called Fred's Fun Run. I met the guys from KnS there 3, maybe 4 years ago. I looked their bodies over closely. Nice stuff. Not priced to bad either. I haven't done business with them, or used their parts, but from my talking with them on a few occasions, and seeing the bodies, I wouldn't expect any problems.
My father is building a car now with a body he purchased off ebay last year. The guy was like 100 miles away, so we took a road trip over to see it, and bought it. The guy went by PF hot rods. I haven't seen him selling on ebay in a while. He was selling knock offs of unlimited products parts. He bought thier parts, pulled molds off them, and had a 'glass shop local to him spray them. He had scoops, fenders, all kindsa stuff. The T bodies were all crooked and flawed the same as unlimiteds, but they were laid up nicer. No voids, thicker, and nicer gelcoat.
I have never used beds or bodies from Speedway, Total, or CCR. But I have visited CCR. The bodies, beds, and chassis they have in their warehouse were every bit as nice as the pieces in their showroom. No special display pieces there. And they were the nicest looking parts I have seen. I have seen people post that their CCR bodies look so nice they didn't paint it. And I believe it. The bodies I saw back in 1999 were that nice too.