I went to an Aaon training class about a month ago, got to "walk the line" in the factory. They had a few units with them compressors installed. I wanted to see them in action, but when we got to Test & Balance section they were working on a big chiller. I personally think they would be the best compressors out there that you can actually fine tune to a system. I would like to try it out on some of my equipment and run some numbers from a conventional scroll vs variable speed.