If you want to learn, make sure to size up and ask the tech if he'd bill you more for watching/helping. Some will go both directions, like taking the extra time to show you little things but only 1/2 billing for the 'help', or just assume you will be a pain, get out of my way sort of fellow, but if you insist to provide 'help' they'll gladly upcharge you for the experience.
I've had both come in, we had a weird delivery experience, and the tech ditched us after day one of two day training on all 3 machines. No cut contour stuff, period. Then crediting that day of lesson back was the worst month of negotiations ever...