Logan,
What a great find. I have two Rainbows in my collection and love them both. Truth be told though, I don't use either one. They are for me are actually worse than a bagless vacuum. After your done, what do you do with the water. It is not good, regardless what the salesmen tells you, to flush that water down any of your drains. The sand and hair will clog eventually. New homes with plastic pipes stand a better chance than older homes with older metal drain pipes.
I can understand the ladies frustration. In this case, it was good for you.
Morgan