The ability to quickly make changes. I can easily change out parts in my machine without having to re-program or re-calibrate everything. This is very helpful when you are working with an OEM part that has a slightly different tolerance than your current machine. You have to be careful to not get too close to the part being cut or it will not work correctly. Make sure you take time at the beginning of a project to set up the machining parameters. It makes the life of the operator much easier. We were able to cut our parts faster and more accurately than we could before.