I don't think a
crb is as good as a rotary, but it may be more easiy used, crbs are so stinkin easy it is dumb. They
glide so easily to get the results. A rotary is just a different animal all together, The fiber seperation/aggitation with the vacuum combo helps so much to pull the debris the minute the fibers have opened up to allow the debris get sucked up.
I believe this is the same for unglided wands vs glided we all know you get more debris out of a carpet with non glided wand, I believe it is due to fact that the fibers are standing up as the un glided wand passes over the carpet giving the debris a much more free path to shoot up the wand. Glided wands tend to fold the fibers over and trap deeper debris from its path to wand slot.
It is crazy how much can hide in a carpet, I did a apartment a few weeks ago where the tenants never vaced, so I forced myself to do one of the best vacuum jobs ever (it was because of that Happy Cleaner guy) I filled 3 vacuum bags FULL it was crazy. the last bag was like lead, it was full of super fine silt and was super heavy...I dont think I would have pulled that all out with
crb or rotary honestly even if I took my time. That silt would have turned into concrete and more than likely glued itself to the fibers and backing of the carpets.
I have prevaced every job sinse then.....I am a real cleaner and no I haven't prevaced every job, but that was just a huge eye opener. So for the past two weeks I have been vacuuming every one.....I added a couple cents per sf to compinsate for my time (nobody has complained so far) and I must say I am using less pre-spray, less wand time so I guess it is a win win situation.