I do not have any experience with the lumineers but in the case of a patient that grinds I would be concerned about breakage. I would be a little leary about the how long they expect these things to last. Let the buyer beware.
i would need to see your teeth and your bite before deciding if you were a candidate for veneers. They may last 15-20 years with proper case selection-- usually that means patients who do not grind their teeth, and have a favorable bite. molds need to be taken of your teeth and your bite needs to be evaluated on an articulator--- a device which shows the dentist how you open, close, chew etc. generally, grinders are not good candidates because they will invariably chip and break and/or loosen the porcelain restorations, which indeed are strong against NORMAL chewing stresses, and not grinding or clenching. see a good comprehensive dentist with alot of cosmetic experience before going forward with laminates--- you may even want 2 opinions-- and be sure to be honest about your grinding habits.. there is no turning back from veneers as indeed they do require drilling on your teeth. they are also quite expensive. keep in mind that the most important thing is function.... esthetics are a distant second, unless you are on television.