Be careful when poo-pooing others' Adwords! Rainbow is a brand name for high dollar vacuums, usually selling in the $1000 to $2000 range. Buying a used Rainbow might save you $500 or $1000. If one is trying to capture people obsessed with clean floors, and given how lazy searchers are, it may not be a bad term to move some rebuilt/used items.
I'd rather have a used Rainbow. $2000 seems a bit steep for a vac.
I guess UK residents aren't silly enough to spend that much on a vacuum. :) I only know about them because my company sells parts for them. No reason to be quiet. There are plenty of amusing and bizarre PPC listings out there.