I second eurekaprince's thoughts...
I use my UltraSilencer almost every day on the hard flooring in the house. I also agree that the clip that holds the combi brush/upholstery tool is a failure, but I remedied that by attaching two thick felt stickum discs (the sort that one puts under lamps and such, to prevent marring furniture surfaces) on either side of the holder, thus providing a firm grip and keeps the attachment in place, rather than letting it fall off constantly. It's a shame that Electrolux couldn't see that as a problem.
Joe