We have had excellent success with this product. We have made well over 75 crowns and onlays in the past 1.5 years. The only two fractures we have had are due to inadequate preparation space and once this was corrected, we have had no other problems. It polishes fast, mills fast, and works. I have one in my own mouth. We have stopped using any other in office CAD product and switched solely to this one. Our patients are amazed by its rapid delivery in 1.5 - 2 hr visit.