I had a Yukon Eagle IV installed this year, got it online in February. I love it with a passion. I'd toyed with a propane-wood-coal Eagle I, but since I had a perfectly good, newer propane furnace in the house already, I simply got the wood/coal version piped into my existing ducting. I had to have a new, separate chimney installed, which set me back about $2500, but once I fired up the furnace I was thrilled with how well it heated, both on nut coal or wood. I've also read about the shaker grate issues, in that the shaker lugs (there are two, one for each grate) have broken on some users furnaces. The only thing I can say is that parts support by the company is superb, although I've never had a problem yet with mine. I have a 2500 sqft house in the U.P of Michigan, where it can get nippy. Also have 15-25 foot vaulted ceilings in my great room, and it still keeps the temps a very comfortable 75degF even on the coldest, windy days so far this year. I like it!