We are a large US based dental group that uses CEREC throughout our organization. I am impressed with the quality of the burrs for our MCXL machines. They are about 30-50% cheaper than purchasing from Sirona and they seem to last longer and have less "dud" milling burs which we were getting too often from Sirona. We will always buy our burs from Honchon. Great price and great quality. Also, I think this is the fastest shipper of all of my suppliers in China. We get the items very quickly. I highly recommend!