OK. I will give you the "not at all comfy". The Dunstall is a bear to ride in traffic. It is not very maneuverable due to limited steering lock. Pulling a u turn is an exercise in frustration. But, on the highway at speeds over 60mph everything terrible about the riding position in traffic becomes very good. Comfy it ain't. It's a 2 hour bike at most before you need to be off it for a half hour.
As for build quality, I just don't see anything substandard. The rearsets are nicely engineered and very nicely finished. The fiberglass is thick and very sturdy. The pre-drilled seat came with holes to mount the stock seat bumpers and hinges as well as the seat locking mechanism. The exhaust bolted right up with no issues and hugs the frame nicely. Overall I would say the Dunstall build quality was pretty high for a very small operation that seemed much more professional than it ever was. Remember Dunstall was basically a garage in an industrial park. The high quality catalogs and striking machines made them seem like a big time business. Seeley, Rickman, Dunstall, Gus Kuhn, Dresda, etc. we're all very small operations that received lots of press. Dresda is still run out of Dave Degens shed and backyard.
Scott