After reading some positive things about this I've just fitted one.
Quite easy but fiddly to fit as it's quite cramped up there. No need to bleed after shortening hoses.
Little grub screws on the cable clamps need to be tightened alternately like stem bolts to get them tight.
You need to cut the cables flush otherwise when you fit the cover it applies the brakes.
Feel? Really odd. Heavier to pull than the Avid BB5s they replaced but a lot firmer. On the drops the power is great, on the hoods it's ok but the heaviness makes them more like a rim brake in power.
Will be fantastic in the wet and mud as there won't be any pad rub or need to adjust for wear.