I have a wacom but cant get used to it at all :-/ If anything, make sure you get a pad that can adjust to accomodate the ratio of your screen(s).
You'll rather want a pad that can shrink your total screen area proportionally to fit on the pad rather then to stretch and squeeze your screen area to use all of the pads surface.
When stretching the screen area to use all the pads surface your drawings get stretshed and squashed also. So drawing a circle would come out as an oval.
I dont know if all pads are capable of this, but I know I found drawing on a pad extremely annoying when the wacom tablet had a different width-height ratio then my apple cinema screen. I only found out later that you can adjust the settings of the tablet to compensate :-P

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