These came with my Bauer Reactor pads.
Initially they seemed okay. The Velcro kind of tears the backs and sides of my knees up when I played with long socks and leg warmers.
They started sliding down really bad, so I sewed a skate lace on the top of each, and would run the lace up into my shorts and tie it to the belt loops. This worked great.
The problem I ran into after I started getting better, and ESPECIALLY when I started using lateral movement a lot more, was the knee is actually fairly unprotected when down. The way it's shaped, the two circles at the base cover a small portion of the side of the knee, and the large rectangle part covers the FRONT of the thigh only. When your knee is bent, The hard "corners" of the inside of the knee are significantly exposed. It started off with a few shots to the meaty part of the knee, and severe bruising. Then the last time I wore them, I had one shot to the meaty part, one shot to the hard inside edge of my knee cap, and somehow or another, I caught a puck square to the middle of my knee cap. I was told I needed a couple of stiches, and wound up having it glued up to hold me over. The wound wasn't a deep gash all the way across, but a couple of small sections it tore open pretty good. It wasn't even that hard of a shot. If it was a hard one, I'd of been boned wearing these.
If your pads have these, and your anything over a beginner, I HIGHLY RECCOMEND new ones, and if you're looking at these, I recommend spending a few extra dollars and getting a stand alone knee/thigh pad. You could probably rig them to lace/Velcro into your pad if that's the issue, and even tie them into your shorts for a good solid, "one piece" setup.
good luck guys!