These are super comfortable pads - great for pedaling and the knee coverage is excellent - they don't slide off the knee like other knee/shin pads I've owned.
However the clip fasteners on either side of the knee are prone to popping off. It can be just an annoyance - hit your top tube with your knee and your inside knee fastener pops off, making you stop.
Or, it can be devastating in say, a race. Had a race crash where both sides popped off, I had to dismount the bike and reattach my pad in the middle of my race run - cost me a good 30 seconds. NOT cool! I'm selling these pads and trying something else.