I bought these glasses because they're on of the only pairs of performance sport sunglasses on the market that accept a prescription adapter (the Smith ODS3). If you have bad eyes but can't or prefer not to wear contact lenses, these are a good option for wrap around sport glasses that will take a prescription insert. They wouldn't be my first choice other than that, but they're certainly not a bad pair of glasses - just not a great one.
The optics and lens tint options are excellent as I've come to expect from Smith. It's the rest of the package that's just not that inspired.
First off, for a pair of glasses that's supposed to be oversize, they're just not that big. I have a big head and they fit, but they're honestly right on the threshold of what I'd consider too small both fit and coverage wise for sport sunglasses. A little more coverage would be nice for wind protection and to reduce glare.
They are extremely light, but perhaps at the cost of feeling a little bit cheap/fragile overall. The Pivlock system is perfectly functional, but feels like it will break in the long run. The arms feel pretty chintzy too. The plastic has quite a bit of flex so they ought to hold up fine through some abuse, but definitely don't feel super high end.
The fit is a mixed bag. I have a pretty average width nose and have never had issues with that aspect of fit on sunglasses, but the nose piece on these is way too narrow for me so they sit a little bit strange. At first I didn't think they would work at all because the fit on the bridge of my nose was so bad, but because they're super light and have very grippy rubber on the nose piece and the arms, they stay on just fine and are pretty comfortable for extended wear.
Overall - acceptable. It's nice to be able to swap lenses depending on conditions and the optics are great, but the rest of the package is pretty uninspired. I've stuck with them so I can use my prescription insert. If it weren't for that, I'd probably look for another option.