I'd go with the richochet - had no probs with mine and feeds as fast as a revvy - tempted to try put the revvy evil paddles (at least thats what I think there called
) in my richo.
The game timer is pretty useful + the ball count is pretty good if you bother to set it up properly (basically gives you a warning when you only have 40/50 balls left)
On the bonus richochet have just released their new bodies which don't need sanding/taping - which is bloody typical cause I got mine the week before they changed the design - ahhh well still happy with mine
http://www.ricochet-2k.com/News.htm
They cost a little more but in the long run as it only uses 1 9v and the revvy 12v uses 2 buying those decent duracells will add up (on a side note don't skimp on the batteries bought cheap batteries and it died straight away with balls in, so spend a little more on duracell)
Hope this helps with you decision
laters