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basically there are no cons really.
Very much this, you don't really see MTB brake column saying that the break-in period as a bad thing.
The only cons I can probably think of, is simply the larger learning curve of modulation the brakes, especially the rear which is ridiculously easy to lock up compare to the rim calipers brethren.
Organic pads a possibly con as I've worn mine out completely after 800 miles.
The biggest pro to me on that list is the extremely light touch, I often get tingling on my hand after a prolong period of using the brakes, but due to the light touch, I no longer get those as I don't have to feather the brakes a lots on a big descent, even in the Pyrenees, I arrived at the bottom with my hand feeling 100% perfect.
But then again, I do ride with massive tractor tyres...
I got 11 speed on the tourer now (bar end shifter on downtube bosses), just gotta wait for the R685 to be available, but right now I'm really enjoying the Hylex brakes.
edscoble-
That pyrenees descending Ed, was it full hydraulic typ hy/rd's? I'm curious as to whether they have the same benefits as full hydraulic because for a while at least I can see full hydraulic being out of reach for me/most people
Also, what about hydraulic, dual pivot rim brakes, surely both of these are being heralded as the next big things separately, put them together and discs have a competitor in the road market?
noBlakes
http://cyclingtips.com.au/2014/10/shimano-r785-road-hydraulic-disc-brakes-review/
The cons column at the bottom is a joke, basically there are no cons really.