OPSM is a New Zealand optometrist type store. I have bought glasses there in the past. The one that I'm talking about is at the Coastlands shopping mall in Paraparaumu, about 40 minutes outside of Wellington.
I bought some sunglasses at OPSM a while ago (they were Fish brand sunglasses, specifically the Cod model). They were getting a little loose when I was putting them on, so I brought them back, hoping they could fix them. "Sure, no problem.", the manager said. He put some kind of glue into the screw hole, and that was to fix the screw solidly. He also gave me advice on how to handle them, "They last longer if you take them on and off with two hands rather than one.", he said, being very helpful and friendly.
About 1/2 an hour later, I was walking along, still at the same mall, and the glasses literally fell off my face. The "glue" ate through the plastic like acid. I appeared at the OPSM store a few minutes later with the glasses in pieces in my hands. The manger who'd "helped" me, saw me and pushed some poor woman, a new worker, towards me to handle his screw up.
Since the service had been so friendly before, I was confident that they would take care of this without any issues. Unfortunately, the girl who was now helping me, didn't actually know what to do about this, and kept going back to the manager who had "helped" me, and kept coming back with advice. In the end, they searched all of New Zealand OPSM stores, and not a single one had the same pair of glasses. They wanted to give me another pair, preferably more expensive, but I didn't like any of them (these are a $70 dollar pair by the way).
In the end, I got my money back and used it to buy contact lenses for Una.
The story doesn't end there! The Fish sunglasses behind me, I bought a new pair of sunglasses at some some shoe outlet store for $20. I lost one of the screws holding one of the arms on and guess where I ended up to see if they could fix them? That's right, the same OPSM.
That poor woman who'd had me as a disgruntled customer was there again. There was no manger this time. I ask her if they have a screw that will fit the sunglasses and she's pretty sure, and goes into the back room. Sure enough, they have the right sized screw, and she'll fix it in right now for no cost. Sweet!
She plays with it for a minute while I look around the shop. "Oh no.", I hear over my shoulder. She comes over to me, and she's screwed the screw in too tightly, and broken the lens! There go another pair of sunglasses.
I made the mistake of telling them that it was only a $20 pair, so they send me $20 in the mail a week or so later. I forgot to charge for the gas to drive down to the place where I'd gotten them in the first place and the hassle.
Anyway - I've only been into that shop twice, and twice I've come away with a broken pair of sunglasses. Not recommended.