subscribing, cause I am in the process of trying to build my own version of these systems. I have begun to see this big debate. A fellow old timer lawn service owner does it his way by just looking at the job and then giving the bid. He has beat me 3 times now. We talk on occasion over a few beers . He has told me that once you get these systems figured out, you can begin to remember them and make them easier for you give the bids on the fly. He was a tool maker at a machine shop, then retired and started a one man. His methodical thinking has helped him build his systems for bidding.