Couldn't be better!
- Familiarity: I've used it several times
If you are looking for a hard-shell knee and shin guard, look no further.
These provide awesome protection with great fit. Ventilation is top-notch for this kind of armor, with vents penetrating through the plate and padding underneath. At speed, you can actually feel the cooling breeze on your shins.
I have gone down hard at rocky Plattekill a couple of times with these, with no rotation or slippage. Last weekend I rode 30 miles of "pedaller's downhill" at Downieville and they couldn't have been better--great articulation for the pedalling, perfect protection from glancing blows when I came too close to stumps and rocks at warp speed, ZERO slipping or rotation, and not too hot in 90+ degree weather (without the calf-protection).
For reference: I am 6'2" with a 32" inseam wearing the size Large. The padding comes down to within 2" of the top of my shoe (5.10 Freeriders), with the plate ending an inch short of that. I ride gravity fairly fast and aggressively, but not at race speed.