I've replaced countless compressors, but never a Sanden. I've been installing them for several years and haven't had a problem. It's a mechanical part and eventually they will fail too, but, the design is superior to the H6 and it's noticeably quieter. If you get a remanufactured compressor, you're at the mercy of the rebuilder, might get a good one, might not. I stay away from reman compressors. Everco has been around for years, and generally has good quality parts, not sure who makes their compressors though. uac... never heard of them. Hope this helps.