I have two mp40?s on my tank. Both wet sides lasted 6 years. The originals were dead quiet and as flow, they worked. Upgraded to new wet sides and exactly the same operation wise. Not saying they aren?t built differently with better parts, but I notice no difference in production from originals. To be honest both my tanks are dead quiet with pumps and skimmers running. My 65 is right next to my bed. In the end, I?m pleased with the new wet sides and the company itself. If I get another 6 years, I can?t complain. No issues with original controllers too. Going on 7 years.