[edit]I just saw the post about the Cajun Express smoker. That actually looks interesting. I'm researching this forum (and elsewhere) to see whether it is good. It sure looks to be well-built.
[edit2]I watched their demo video on YouTube, and it achieves shorter cooking times primarily because it smokes at 350 degrees. The "pressure" part of the design is totally bogus, as you can tell by the lack of any sort of interlock for the front door. If there was any sort of pressure inside, and you opened up that door, really bad things would happen.