I’ve used them...be prepared to use everything a lot. You might consider using other similar cheaper carpet cleaner liquid. Although the rug doctor spot remover seems to work pretty good. You will be going back and forth refilling and mixing A LOT.
What seems to be the best is one wash followed by two rinses. Of course I will never know for sure until it is totally dry and has been vacuumed once or twice.
Actually, I was happy with the balance. Doesn’t bother my back so much as the “Work” button has to be kept continually pressed for it to run...