I'm somewhat of an Oliver Peoples afficianado and have followed them for their entire history, which is quite unique and interesting. OP is very important in eyewear history of the 1980s-90s in that it was very instrumental in setting off a significant retro trend. Then they became more like other designers and eventually reintroduced their own retro vocabularly with some frames.
Regarding quality, however, from personal experience with the three OP (opthalmic) frames I actually owned and wore, I didn't find the frames above average. However, the first two frames were very unusual for our era in that they had zyl tubes wraped around the decorative metal eyepieces, so problems with the tubes discoloring or cracking would not apply to the vast majority of frames. I also have a problem with chemical reaction to many frames - metal or plastic - which discolors frames more quickly than with many individuals, and I'm one who notices the peeling/discoloration more than most people would. All my OP frames experienced this, as they were coated base metal. OP has, however, eventually went in for titanium (I believe) which might fare better.
Just a few remarks which may not apply to the frame you're interested in but you did ask about OP's quality in general.