I had the HF unit for about three years, replaced the bag with a Wynn canister filter. It worked well, especially in conjunction with a trash can separator/ Thien baffle. For the money, it's hard to beat. My unit did eventually die, I gave it away to someone here on NCWW. Probably a start capacitor. I know several other people that have had the HF unit for years without problems, and also know some people who have had Delta and Grizzly machines blow up within a year, so I can't really judge whether it's any better or worse quality wise.