He gave Subaru auto conversions a bad name. I ALMOST bought into his slick presentation when I ran across his display at Arlington fly-in, while I was looking for a powerplant for my first RANS S-7 in '97. I ended up going with a different Soob converter, one who had no fancy brochures but flew it in (with over 1000 hours TT) along with another actual flying example. I put 1300 totally trouble free hours on it before I moved on to my second S-7, belt drive BTW. That converter (Stratus) is now gone, the original guy sold out, and the second owner seems to have lost interest.
Meanwhile, the Rotax 912S I used for my second S-7, saved me 30 or 40 lbs., even better fuel economy, and a cleaner cowl/less drag as it all fits inside. This summer I reached the 2000 hour TBO on it, totally trouble and event free, and at 2200 hours I went ahead and more or less put a new short block in it, selling the old components to offset the 10K cost somewhat. The main thing about all the auto conversions, regardless of the redrives or the vendors, is the weight of them. Even ones that work fine and are inexpensive (mine was about 6K!) are heavier, plus they need a bit more room, tough for a tandem design most times.