Been totally digging my Poseidon Z keyboard with the brown switches, that I was totaly soked to win in a contest a while back. it has been working perfectly for me, and toally even better with the little O-rings.
Those Red Orings are about 2mm the Blue ones they make are about 4mm I think, which would certainly shorten the keystrokes and take a bit more of the 'thwack' sound out if desired.