V.C.
Boy, have YOU pushed my 'passion button'! LOL
I have always been intrugued with vacuum cleaners -- took several apart and got them to work better, etc. I never did like uprights (simply because i grew up with a canister). N-E-ways, in 1996 at the tender age of 39 I got the 'full-effect' demonstration of a water vacuum and haven't looked back! There is NO OTHER vacuum that can clean like a Rainbow, OceanBlue or any of a few other water vacuums. I sold Rainbows for 8 years straight (and still would if I was able).
I had a Sears (Kenmore) canister for several years before that and it had about the most 'suction' of any vacuum I've come across (and believe me, in 8 years of demonstrating Rainbows, I came across a LOT of vacuum cleaners!), but suction is NOT what cleans -- it's the amount of AIR that's flowing THROUGH the tubes and filters. Once ANY dry filter gets coated with dust (which happens REALLY quickly when you're SWEEPING UP DUST!), it loses about 80% of its efficiency (compare to trying to dry clothes when the lint filter is totally covered with very fine (not fluffy) lint or trying to drive a car when the air filter is dirty and clogged. You lose your power and efficiency, right?) The water 'filter' in the Rainbow is about 90% efficient from start to finish. Now -- USING them is kind of a bummer. You need to put clean water in them each time you use them, AND you MUST empty them as soon as you're done or it starts smelling like sewage w/in a few hours; but they are SO, SOOO efficient. I even have several used ones that I need to get out of my house. (The reason I'm unable to 'sell' any more is that I had a period of depression -- several deaths in the family, etc) and just couldn't 'sell'.
If you choose to go with a 'dry filter' vac, though, I'd surely recommend one with an actual bag instead of a 'bagless', because their filters are smaller (surface area) and clog faster -- plus there is usually a SERIES of filters that you must check often!
ANYONE who's interested in a good used Rainbow, please contact me!!
God bless, and happy shopping (and cleaning)!
P.S. I know it's kind of hard to believe, but sometimes when I went to do a demo at a house that was already using an older Rainbow, I could TELL by the look of the carpet (brighter and standing up fluffy -- even if it was 20+ years old. Carpet-layers told my boss that when they took up carpets from households that used Rainbows, they didn't find those piles of sand and grit UNDER the carpets, either!