Double-helix vs. Quadraflex vs. Vibra Groomer
The one thing I like about the double-helix is that it makes pushing the power nozzle easier; as if its self-propelled. At least the double-helix digs deeper into the carpet; it even outcleaned my Eureka Dial-A-Nap w/VGII or Hoover Quadraflex PN (with either a Filter Queen K31X or TriStar CXL) I sometimes used to use the Quadraflex for vacing problem carpets; but a Lux or TriStar A101 PN with double-helix outperforms most PNs on problem carpets (deep shag, thick plush) With the double-helix, I don't really need to use a pile-lifter before shampooing carpets; unless pet hair is an issue and/or the carpets haven't been vacuumed in a long time.
The Electrolux PN6 (paired with either models G, L or 1205) or TriStar A101 can't be beat![this post was last edited: 3/11/2013-19:58]