We used Bissel pf's for years. The quirkiest thing about them is how you can totally rebuild a 70 buck vacuum. Belts, brushrolls, filters and lots of other bits and pieces available through bissel.com
At one point I felt I was running a Bissel rescue shop, found one in a ditch, one in a garbage pile. Had red ones, green ones, purple ones, blue ones, took them home, rebuilt and they ran like a charm. If they were quieter I'd still use them, with hearing loss they got annoyingly loud even with new brushrolls (yeah I know, makes no sense) One of the most aggressive beater bars on the market and loose loop style tufts wouldn't get tangled in the beater bar. They served us well. Currently a Shark guy, the new ones are lasting us a lot longer than the early builds.