I have. Twice. However the gloves held up well. First time was a low-side get-off at about 70-80 mph, and I ended up doing a nice little hand-plant on the palm of one glove in the process. It scuffed the palm a bit, but seems to be fine for further wear.
Second time was a relatively low-speed high-side. Did a bit of a slide and dragged the back of the gloves along the asphalt. CF armour on the back took some scuffing, but did a great job at protecting the hands. I just wish that the SMX boots I was wearing had done as good a job protecting my ankles as the gloves did with my hands.
Overall, I give them a big , and will probably replace them with the same model when the time comes.