I always swore I'd never replace the Xtr V's on my Blur with discs until I wore through the braking surface on my rear rim. Ended up getting some Hope Pro II's and must say I was blown away by their performance. They've been practically maintenance free for a couple of years too. The cost, light weight and simplicity of rim brakes still appeals to me but for mega muddy conditions or really steep downhills I'm sure glad of my discs!