I use them and they're fine. I thought they would squash and flatten after a few rides (like some of my home made shims did
), but they've been fine for 6 months so far.
I actually use all four of them to supinate my feet as much as possible.
the "con" is the bloody price!!! $40 Aus dollars for 8 bits of plastic and a few screws!!!
I
think I had some slipping issues stacking them on top of each other (although I may not have tightened the cleats enough -- but I though I did
), so, because I use more than one, I taped them together...no problems!
I assume for ITB problems you'd wanna pronate your foot?
I dunno if this is ideal unless you're a natural pronator. If you're not a natural pronator, which is most of us, pronation could cause other problems.