Have currently have two - a $300, 900 W Sharp upright that is fairly lightweight even though it has a rugbeater built in, and a $50 Red Devil canister vac w/o any beater attachment.
Interestingly, the Red Devil's bearings began to go out within the first year (in 1992). My solution was to spray them with Rusty Duck
, a commercial-grade silcone grease used for firearms and fishing reels. Here we are, 18 years later and after hundreds of hours of use (and five moves) and the Red Devil is still going strong. I did have to replace the broken on-off switch with a Radio Shack toggle, but that's worked well for 16 years. I'm simply amazed I can still find bags for it!
Meanwhile, the Sharp had to have the rubber rug-beat drive belt replaced. Otherwise, it's fine, too. I purchased it in 1994.