My glasses were the 2 for 1 deal, ended up costing me around $600 all together! I didn't buy the warranty as I was/am moving away. A month and a half later, despite asking for the protection spray, my glasses have multiple scratches on them. Tried on the other pair and the lenses, not noticeable when you just try them on, are different.
They also messed up on my sister's lenses. Heating it too high so that the lenses were "wavy" (unusable) because of high heat and they "didn't notice" it until she tried them on and pointed it out to them.