My family owned a Whirlwind back when I was growing up..
The bagless system wasn't very efficient, but better than anything Eureka produced for about 15 years afterward. The real problem was that the two pre-motor filters were extremely thin, and not sealed, so they let a ton of dirt into the motor. Our first-gen Whirlwind (that I begged my Mom for haha), had a burned out-motor after just a year of use. I took great care of that piece of garbage too. My parents were furious!
At the time we didn't have Dysons in the US, and I thought the style of the Whirlwind was so radical and different, in yellow and gray, with a clear hose. I didn't know that Eureka had just blatantly copied Dyson, their bagless tech, and their style!
Eureka got sued over that vacuum by Dyson, and they're still playing catch-up with their horrible bagless models, which finally have dual-cyclonic filtration again.
In the US, the late 90's and early 2000's were a pretty dark time for bagless vacuums, and department store machines in general. Not to say they're all great now, but there are much better options than there were, and a lot of companies learned from their mistakes, after a decade of high-maintenance, weak-performing, poor-filtering machines. A lot of those early bagless offerings were huge and heavy too, and their on-board tools were nearly useless![this post was last edited: 11/29/2015-17:02]