Wow! I just got my wh20 a couple months ago, and i agree with everything being said about it! I really have no complaints except when u need to fix something it can be a pain to get to.
My wife has recently got into pinball (praise the lord), and she loves TOM. I never played it, until she told me how much she liked it. It is also an amazing, yet completely different game than wh20. Lots of gizmos!
Play them both and pick the one u like best, but i can tell u im never gettin rid of white water.