Hello, I'm looking at purchasing a small batch gas drum shop roaster under 10lb capacity in order to comply with local air quality requirements of no afterburner. I've been researching Dietrich IR, Ambex, US Roasters, and Primo Roasters as my best choice for a beginners machine to learn the craft of roasting and cupping. While I have found quite a bit of information on most of the roasters, Primo seems to be the most elusive as far as information, particularity on the matter of no air flow control on its 6lb IR roaster. Now I realize I could contact the manufacture, but I'm looking for more than a sales pitch as compared to the real world workings of this machine. Has anyone had any experience on this roaster, its roasting ability, and why it may be a better choice(other than price) than say a Dietrich or US roasters which are both on my short list. Thanks much.