Interesting facts...
Sebo_fan, I've never used a bagged vacuum in my home, so I can't offer my thoughts on bagged vacuums.
I learned the clear bin information from Wikipedia. I looked up the Dyson company article, and that's where I got my information. This, in turn, came from an article called "A Clear Bin Policy" on
www.jenkins.eu. I don't have the Dyson book, but I learned about polycarbonate vs. shattering plastic from Dyson's testing videos on Youtube.
Bagless vacuums do have lots of parts that will eventually smell, especially the filters. A single cyclonic bagless vacuum, such as the Bissell Powerforce Helix from Walmart, relies on filters to trap all the fine dust. Cleaning out said filters is a very messy job, since they're packed with dust!
As for charcoal filters, some Hoover vacuums, like my Hoover Windtunnel 2 Rewind Pet, have a HEPA filter with a layer of charcoal on its exhaust. That helps to get rid of pet odors. There is a rinsable pre-motor filter located above the dust cup, which gets clogged with hair quickly. When vacuuming floors, all the dirt travels through the hose, which when attached properly, has two bends and turns in the dirt path. This hose gets dust and grit stuck in it. I have to unclip the hose and stretch it out (with the vacuum running) to suck whatever's stuck in the hose into the dirt cup.
Super-sweeper, your facts seem like ancient history now! Bagless vacuums became popular in the early '90s. That was before I was born!
Here is a link to the "Clear Bin Policy" article.
http://www.jenkins.eu/mym-spring-2004/a-clear-bin-policy.asp