And the same..
http://www.chainreactioncycles.com/shim ... prod119956
I have a set of these on my commuter, which I also take off-road and they are unbelievable. Literally.
Power, modulation , much better than any V-brake.
I also run BB5 cable discs on another bike & they are easy to set up, and powerful if you're using levers with the right amount of pull & strength; and if you use washers to correctly space the caliper from the disc. Anyone who can't set up a BB5 and gets rub/squeal probably can't set up any kind of brake.
I also run Maguras on 3 of my MTB's, v's on another and the rest are all hydraulic disc.
The Maguras are a pain in the ass anytime you need to change a wheel, remove a wheel (to put in a car etc) and you do need to remember to 'clean' your rims before you need to stop when in the mud.
Aside form that, there's no greater stopping power to be had from BB5s or M355s than Maguras, but they won't 'realign' themselves if you crash, and it's a lot easier to change pads and pop wheels in/out using discs than with any other kind of brake, V's, canti's, Maguras, u-brakes, anything.
I also use Magura Louise discs, Deore discs, Hope and Hygia on other bikes, all hydraulic discs and nothing is even close in terms of pure stopping ability. You might not think that you 'need' it, but those times when you're in trouble (be it a pedestrian walks out into the road, a van pulls out right into your path, you realise the path stops, anything) when you really need to haul up, hydraulic discs are the business; you never need to worry about mud very often, better performance in rain, no worries about wearing
through your wheel rims!! and unbeatable modulation & grip in slow situations.
Not everything with discs is about high speed - their control and modulation is so far above any V-brake or canti that if you're slowly manoeuvering between trees, trying to hop round rocks, anything slow-speed where maximum control is required, discs are much better, I find, than V's - especially if you're on a slope edge or going down a steep gulley, anything like that. There's no reason these days, if your bike can hack it, not to go disc.