Coach, I have used fields printed on magnetic sheets and I will not choose this method again. No matter how thin you get the magnetic material (and there is a minimum thickness), it is another layer of material between the vibration and the player. In short, everything got SLOW and jerky. I was able to adjust the motors and placement to smooth it out and speed it up a bit, but compared to a vinyl cover it is woefully inferior.
As a result, I stuck that board to the side of my fridge (looks awesome by the way) and redesigned a new vinyl field for myself. My board runs like a dream now on two tudor electric motors using the Tudor blip switch as well (aka Play Action Remote).
I would spare you from the expense of going through the process of getting a magnetic field only to not be satisfied with it. Obviously, to each his own, however. Some of you out there may have had a better experience. For me, vinyl is clearly superior.