We have a 4-ton Tranquility 27 two stage package unit. Overall, I would call myself fairly satisfied, but surprised at the frequency of repairs. The unit was installed in April 2010. Six weeks later the ECM motor module went out, shutting down the whole unit. I had chosen Climatemaster partly because I live just an hour from their factory in Oklahoma City. I was disappointed when Climatemaster told me it would be 7-10 days to get the new part. Luckily, my installer was able to hurry the matter, getting it in about 5 days. In June 2011, I had a run capacitor go out. Not hard to fix, but still without air for 2 days, and had to pay for the repairs myself. Now, in August 2012, the unit was not cooling well, I'm told the evaporator coil is leaking, and will have to be replaced. Its is a pretty major repair, and should be covered by warranty, but I'm still out for the service call. Were it not for these issues, I'd be very satisfied. The unit is quiet and comfortable in summer and winter, and the electric bills pretty low. I think Climatemaster could benefit from some customer surveys during the first couple of years, to focus on recurring problems. Their customer service is average, I'd say.