I bought a used one. It sat around for ever but we just got an apartment account that consists of 5 high rise buildings. We now use it there all the time. Its not bad at all for that application. Faster setup than using a portable, and its light. It does leave the carpets pretty wet but because of the high flow, it cleans fairly well.
I would never use it in someones home though, way to clumsy to move around furniture.