been playing for a week now with J&H C55 on forehand and about a month with Vega Pro Hybrid on backhand. combination is great, if not even perfect game wise but am a bit concerned about C55 durability ... it has some 12-15 hours of play in it, half of it doubles (albeit during the national amateur championships with quite some abuse on the way to the finals, but still) - it looks pretty beat ... playability and grip are still the same as when it was fresh out of the box, but looks pretty beat. I love the combo, so I wish this won't affect the durability - even though the rubber is amazing I can hardly imagine getting new C55 every month ...
as for the impressions on C55 - I don't have much bad to say. lots of control, great feel, super spin, allows me to take some counterspin of the table as of the midrange (don't go off to far, though, I feel the strongest at the md distance). openups with brushing, with proper placement opens tactical advantage (if the ball is returned at all), serves are actually the spiniest ever), openups with 70/30 spin-power ratio are also pretty damage-inflicting on the opponent and when going for counter topspin I think there is still a lot of spin in the ball if I let the sponge engage (I tend to go into the sidespin territory at mid distance and I see how much more curve the ball has than to anything I had before). and, maybe this was just daily form, but I was never able to counterblock (where you block the ball, but add topspin on it) as effectively on forehand as I can with this rubber. and just because of this part I am thinking of putting C55 on backhand as well, as this is one of my stronger BH qualities, where I just counterrotate the ball and pushing opponent into defence with it. I think it would be even deadlier stroke with this rubber. but - durability!?
also, did anyone compare C55 with Omega 8 China?