In my 36 years of working in the industry, I have used many of the higher-end units and none have come close to Essilor’s Mr. Blue. It is simple to use, worry-free and so precise it still amazes me. I especially like the sealed chamber because it virtually eliminates odors and dust created by edging poly and high-index lenses. In addition, the Customer Support is extraordinary. They will go out of their way to ensure all of your expectations are met.