First time out with these gloves, I had an 85 mph off on the track. The TPU palm sliders on my left hand ground down, but did not grind through. The gloves took little damage otherwise - a tear in the gauntlet adjustment cuff, but that's it. The fingers are intact and so are mine.
I'm convinced that the TPU palm sliders saved me from far worse injury - if my palm had bit into tarmac at that speed, I'd have been looking at a broken wrist, arm, or collarbone, most likely. I can't say enough positive things about these gloves, and I'm ordering another pair with zero hesitation.