We just bought and assembled it. It seems to operate very well at 37 degrees exterior temp after a few minutes warming. So far so good. Assembly could have been smoother with 1) better pictures that actually showed what was being screwed in rather than a broad picture of the general area; and 2) the threading in some holes was rough and made screwing in screws/bolts more difficult than it should have been. Took about an hour but I think I could assemble in 30 minutes.