I've read that manufacturers & repair guys love the bagless models because people don't clean their filters and the motors eventually burn out on lack of suction. I can tell from across the house just by the change in motor pitch when our vacuum's filter has reached its limit.Getting a Hoover bagless cannister vac.
I used to rinse out our bagless vacuum's HEPA filter after each use (a bucket of mud) but I've found it's much easier to clean it with our shopvac (which has its own HEPA filter). So whatever I'm saving in $2 bags I'm devoting to the labor of vacuuming a vacuum.
Life's going to be a lot less complicated around here when the bunny goes to his great reward, our kid leaves the nest, and I cut off my ponytail.