I have a Rainbow and LOVE IT
It is an awesome machine! However, I'm a clean freak and the first 2 years I vacuumed daily with a well maintained Kenmore Can in my brand new house with berber. When I got my Rainbow in 2006, yes the water was dirty, but not horribly dirty....so the Kenmore canister was doing it's job. I just like using my rainbow to dust the house because it has the 14 foot hose and small wand and dusting brush that I can get high and low. With any other vacuum, that quick release handle is too bulky when dusting with the dusting brush trying to get into tight spaces. I sometimes use the rainbow PN, but not always. I find more and more I'm using the rainbow to dust my entire house floor to ceiling.