I was having major IT bad problem. After 4k at a slow/moderate pace it started to hurt. They day my knee near gave out was a wake up call. I had a customer from work recommended I try the roller. It does hurt, but boy it took less than a week before I noticed a big difference. I'm not an advanced runner, I'm a 2+hr 1/2 marathoner so not fast, and not crazy in training. I do however enjoy it and really dislike things hurting. The roller gets two very enthusiastic thumbs up from me.