Logitech Momo vs Act Labs Force RS:
I have purchased an Act Labs Force RS - and I couldn't pawn it off on some poor fool fast enough. Something about that wheel (while having a great system of connections, every feature you would want from a clutch and positional shifter to an array of buttons) just isn't right.
It felt "notchy" and "clunky" for a lack of better words... and really I wouldn't recommend it for anyone.
However, if you haven't purchased a wheel yet and don't care about force feedback, there is a brand of wheels (while very expensive) you just have to look at - TSW's.
http://www.thomas-superwheel.com
Its not a commercial product - you'll have to order it direct - but IMHO there's no better wheel out there.
--Micah