The PX 15 is a semi metal binding, the heel track is metal but the insert is plstic. I have seen a few fail, but I could say the same for any binding on the market. I had an old set of PX 12 years ago, and they were fine, not as solid as a STH, or jester but still very good. Maybe look at getting the Rossi or Look version rather then CoreUpt, simply as if you need to warrenty it may well be easier to deel with the big companies then someone small like coreUpt.