I actually have Ivoclar Empress veneers in my own mouth. It is probably the most commonly prescribed pressed ceramic veneer / crown in dentistry today. It has been around for a long time and Ivoclar-Vivadent is the manufacture- they are a great, ethical dental company IMO.
Empress, as a material for all-porcelain crowns and veneers, has been around for a long time, and it is a proven and tested material of good quality from a reputable company.Like everything else in dentistry it is not a perfect material, so the quality of the final product will be determined by the skill of the ceramist and whether it is a good indication in your mouth, as determined by your dentist