The reason construction estimating software is so important is that it really helps contractors come up with an accurate quote. Customers really appreciate this and they recommend their services to others because they feel like they were given the information they requested up front before they ever committed. This makes it easy to make decision when you know what the overall price is going to be. Or, at least very close to it.
The reason many contractors use an on screen digitizer is so that they can get the information as quickly as possible. Those contractors who give you a quote without using any type of software are more than likely fooling you. They give you a cheap price up front but by the time they are completed your price has at least doubled if not more. This is really common with construction projects so it really is something you will want to keep in mind.
So, the next time you need a job quoted make sure you call a contractor that uses construction estimating software to come up with a price. They can put in a few measurements, materials, and the like and come up with a price that is very close to what you will have to pay. This is the best way to save money and not get in over your head. You will be thanking yourself the entire project when you realize the quote price is very close to the actual price in the end.

