IMHO the Deltas are Crap.... I had 4 failures with them before giving up and returing them. While the product was sub-standard, the Customer service was excellent. btw their touted "Austrian Cut Crystal Lenses" are aysemmetrical and they send two lefts in the kit. I guess buying 2 seperate lenses (left AND right) or molds from the maunfacturer was too expensive.....
