My friend has purchased several pairs from Zenni but the frames kept cracking around the lens even though she only wears them for a couple of hours each day. They'd send her a new frame and it would do the same after a month or two. She didnt really like the metal frames they offered so kept choosing plastic frames. Finally she got fed up with Zenni and purchased slightly more expensive glasses from Warby Parker and has had zero issues since. It definitely feels like a "you get what you paid for" type of story here. Zenni is much cheaper than buying frames from Luxottica but there's definitely some happy medium where you aren't overpaying for glasses but still buying something of comparable quality to the overpriced brands. She used to get Ray-Ban frames while on her parent's insurance but when she got her own, she could get a free years supply of contacts or Luxottica-priced pair of glasses. So now she gets her big supply of contacts from a retailer using insurance and buys a new pair of Warby Parker glasses using HSA money.