In reply to Rog Wilko:
> I've got cable operated ones and they're fine. Can't comment on the hydraulic ones, but to me they sound unnecessarily hi-tech and therefore likely to be more trouble (not based on personal experience though).
I'd say the opposite, I've had two cable sets, one pair seized up and I had to bin them, the second set is on my CX - they ok but need plenty of fiddling with to keep well tuned. Then I've had two hydraulic pairs, one set needed bleeding once (easy), the other never. The hydraulic ones work better and need less maintenance I've found.