I would like to know the operating difference of the wide variety of units that are represented here by all of us. Earlier this fall I had a chance to meet Mark? (name?) I think from AHoNH? at the Freyburg Fair in ME. Very nice guy, and I had a bunch of questions for him, but because I was not going to be a customer (already had my wood Gun) and he was loaded with potential customers there, so I stood down. In our little bit of conversation that we did get in, he was talking about o2 sensors and different fans and in general, a ton of gismos that are not in my WG. Rembering reading somewhere (here) a comment that you could fix a WG with bailing wire and duct tape, (I'll second that) it makes me wonder the following; (of all brands) What are some of these controls What is the benefit If efficiency, how much What are the potential probs. if that fails Is it a "must have storage" unit Really not wanting to get into what's the better unit (Ford vs. Chevy) type discussion, just more factual type stuff and please not to technical. This is a curosity and learning thing for me and I think it might help some new folks on here with their decision making. I stumbled across the WG guys crusing around on the computer one night and thought that they invented the gassifaction thing! I had never heard of it. THey were close to where I used to live so I checked them out in person one day, I was impressed- sign me up! Totally my ignorance of burning wood, but luckey me, I am very satisfied, but maybe with some more facts and knowledge I would have made a different choice? Please feel free to add relevant questions to mine. In shorter words, I only know my WG tell me about yours.