I don't think you can call a machine easy - it's going to completely depend how it is set up. Case in point take a T3 I owned at one point, I sold it because it was too easy. I got to the Wizard mode 80% of the games I played on it and the rest I was always very close. I sold it to an operator I knew and he put it up on location and made it steeper, opened up the outlanes etc and I never got to the wizard mode again, but could still get very reasonable scores on it.