Familiarity: I've used it once or twice and have initial impressions
Upgrading the trust Guide R brakes to the RSC model. I love the modulation and level feel of the standard R model but am looking forward to having the adjustable contact point for when the pads start to wear in more.
Love these brakes! Easy to install and maintain and tons of stopping power. The four pistons give me a lot of confidence for steep sections knowing that I can stop.
They will fade a little on longer descents but nothing to really worry about.
The lever adjust is a really nice feature so you can really dial in your cockpit. The piston adjust is another great adjustment that lets you really dial in the feel of the brakes. If you are thinking about Guides, get the RSCs!
I have ridden Shimano XT brakes for as long as I can remember and after trying out these on a demo I have switched over. The stopping power is great. Run with the centerline rotors and you wont be disapointed.