Valid points, Doug, and as I stated above, there are many variables. Choice of fluids is obviously critical and we are much more in agreement than disagreement as you say. The fact that the KAB/decent vacuum/RRL combo can improve upon the Monks/Nitty Gritty combo even on a comparative basis on a 2nd/following cleaning at about 1/25th of the price is pretty impressive though and the main point I was trying to make. I think that many would say that the Keith Monks, for $5,000 with just about any decent fluid should not leave anything behind for the $159 KAB to pick up on a 2nd cleaning. I've had the opportunity to pick up a used Monks at a very reasonable price, but based on my experiences, just don't have the interest in doing so.