They are absolute pieces of shit... sorry but I'm being brutally honest... I've waisted my money on many of the home spotting products so I can give them real life advice regarding those products. And the products never fail to meet my ultra low expectations.
The Spot Bot has terrible suction, coming from a 1 inch hose. The spinning extractor head doesn't even maintain constant contact with the carpet and it will leave a spot soaked.
The best product I've found that bissel has is its Quick Steamer.. uprite extractor. It has the same size vacuum motor as its bigger cousins but on a smaller head so it packs the best suction of all the bissels. It performs the best at extracting moisture.