I just attended a course on Lumineers In Cincinnati last week. I have done many veneer cases with a no preparation technique, but have yet to use the Cerinate Porcelain that Lumineers are made from. The esthetics that I had previously seen with Lumineers were not up to the quality of what my lab technician in Utah was capable of doing. I went to this course to see for myself. Although many of the cases were nice, I still feel that our hand made stacked porcelain veneers offer more natural translucency.

http://www.dentalhealthcenter.com/lumineers.htm

Below is a case I did with minimal preparation. There was no need for shots or anesthetic to do this case.