I've had a couple of AC filters that lasted past 20 yrs until motor burned out. Aquaclear is now owned by Fluval.Longest lasting HOB I ever had was an AC70 that went over 25 years before it finally gave up the ghost. Never had an AC70 last less than 15. Had a bunch of Aquaclears(not just AC70s) that had been in service over 15 years before I down sized the number of my tanks. My best luck overall has probably been with AquaClear and Fluval.