My quick reply about 2 pairs I ordered thru
http://zennioptical.com wayyy back when these deals were first mentioned.
Both scripts were current and in general for years have remained the same, but were current when ordered.
First pair - sunglasses for myself, just something to toss in the car for days I wore glasses and found it too bright.
These were ok but the frames were SUPER flimsy, and vision out of right eye was a bit weird, sorta as if the only clear vision I had was if i looked a bit to the right vs thru the center, one arm broke off within about 3 months so they ended up in the trash soon after.
Second pair - ordered at same time, was for my wife as a backup set of glasses, again recent script all confirmed before sending, glasses came frames were ok, lenses looked good (clean polished didnt look like $19 glasses actually spent like 35 for hers cuz we did thin lenses and antiglare etc), yet she couldn't see jack out of them clearly.
Spent about 5 days and numerous emails trying to get this corrected was told a new pair was coming on 2 different occasions, never got new pair. Figured it wasn't worth the time to keep trying to get replacements for hers and mine broke soon into owning them, so overall I would say it was a .5 out of 5 for our experience.
Other customers swore by this place so it may have just been a fluke, but for me its costco all the way, if it isn't right they go right back and they fix it...my last pair from Costco with thin lenses and glare/scratch resistant was just over $100 ok not super cheap but they still are together over a year later and everytime I walk into Costco they tighten them up, clean/check them for me etc etc.
YMMV and to those who did order thru Zenni and they came in good shape etc, congrats and enjoy the savings (not knocking them totally) just my experience with them was a washout and I lost about $60 on two pair of glasses.
Bill