Had glasses from Sheffied branch in September 2020 and they went back three times for marks on the lenses before they were 'almost' perfect. It's now August 2021 and I needed a decent (I play football in my spare pair) and 'classy' second pair of glasses for an imminent wedding, so I thought I'd try them again. However my 'brand new' designer acetate frames arrived scratched from the laboratory. I took them into the store (once again) and after a bit of deliberation they ordered another new frame. A couple of days later I had the lenses switched in-store (I was first in line and when I came back half an hour later having given them some time to fit the lenses into the new frames, they were still not done. Other customers were being attended to however and it was 'almost' like they had been standing in line before me. All I got as an apology was "they're not done but as you can see we are busy". So I left them until Saturday evening... When I picked-up the new frames they too were scratched, albeit in different places but still noticeable when the light hits the frame in that area, pretty shoddy and embarrassing to be completely honest. I made a comment about the marks and the Costco staff member's response was "you can't expect them to be completely unmarked!". Erm, why can't I? If they're coming from the Italian factory already scratched then you have an even bigger quality issue than your own staff are creating. I've given in now and i'll keep these as scratched as they are, hey they're only superficial scratches on a £170 pair of designer glasses and hopefully no-one will comment, because if they do i'll just tell them the truth, avoid Costco Optical at all costs. The only reason i'm giving up on going back again? Because it's totally embarrassing when you have to keep returning to complain, explain the issues and they continue to look at you bemused because they can't see any problems. I believe that in itself is the problem, maybe my standards are too high, to expect the 'perfect' product I actually paid for. I know Costco prices are cheap but in my experiences so is their workmanship. Relating to me, I've heard "we don't get many returns on lenses" and "we never get problems with frames" but also overheard (relating to someone else) "tell him we'll make the complete glasses again but it's a one-off goodwill gesture", so at least it's not just me that has issues. I'm fed-up of bad experiences in the Costco Optical department in Sheffield and next time I'm going back to Boots, higher prices but better quality and maybe if I have an issue there, they too may see it without me having to go into embarrassing detail.