The Good: Great lever feel.
The Bad: Expensive for recreational riding.
I have been riding these brakes for over a year now. I have since swapped bikes, and had to move these brakes to my new ride. Just need to replace the hose for the rear, quick bleed, and back out riding.
I love the instant engagement of the race brake vs. the xtr trail brake. They are plenty strong for my type of riding, XC racing. Even so, I have taken them to North Carolina mountains and never felt brake fade on 4 mile descents. The new ICE Tech rotors are no joke. Lower running temperature means more stopping power/no fade. Best upgrade to any bike.
One change I have made to the stock brakes are the pads. They came with resin pads. I have since added Metallic pads with the radiator fins. I like instant engagement, and the new metallic pads also add a ton of bite.
XTR is quite pricey, but I promise any Shimano brake, SLX or XT brakes will have the same power. More reliable power means you will be able to go faster.