Bought these tights for a half-marathon. I'm not a runner and I was looking for any extra support. I don't know if it was the tights, but I didn't have any pain or problems after the race. They looked and fit great.
One thing..I am 5'2, 105lbs. I have pretty thin legs, but the XS was too tight on the back of my knee (pinched it when I ran). I exchanged for the Small and it was perfect.