I saw one on Craiglist for $150 in MA and darn near drove down there to buy it; that is how much I loved that Surdiac.
I did not drive over it because I was mad at it though. It rotted out the back part of it and so I bought a different stove. I put it out in an old dump I had not realizing I probably could have salvaged it. I dozed that dump a few times, but this June I cleared 10 acres of forest into field, and that dump is in now in the center of the field. Of course, 10 feet below ground level!
I really wished I had that stove back. During the ice storm of 1998 here in Maine we kept warm by it, and ate off it for the 14 days we were without power. I actually got 14 hours of burn time out of it during one of those days. Nice, nice design and I have never seen anyone else mimic their design. Not sure why. Long burn times, simple, no electricity and amazing heat, though I guess that is just heating with coal in general!