The warp on the edges of the lenses isn't too bad, and I adjusted to it quickly enough
934608
If you need the safety glasses and are a bit myopic, these are handy as all get-out. The warp on the edges of the lenses isn't too bad, and I adjusted to it quickly enough. Would recommend.
1249575
The mirrors themselves work more or less as advertised.

As some others have reported, the joint allowing the mirror to be adjusted became fairly loose fairly quickly, and that's the reason I docked a star. it's not so loose as to be unusable, but I have to reset them for both the trip going to a place, and by the time I get where I'm going, I have to do this again.

They're not curved in any way, so the field of view behind you is also rather small. But it's still better then the tiny mirror I had that replaced them. I'm blind in my left eye, and having that left mirror in particular is extremely helpful in seeing what's in my (substantial) blind spot.
1067717
They are good cheap glasses.  Sturdy construction so they'll hold up reasonably well under normal wearing conditions.  That being said, the lenses are not affixed very well in the frames.  One drop from your head onto the ground and the lenses pop right out.  They do pop right back in but because they're polarized, you must be sure to adjust the lens clockwise or counter-clockwise to kind of re-calibrate the polarization ability, otherwise the one on position and one off position lenses will cause headaches and visual strain.  You just have to keep adjusting lens until you can see well again with no strain on the eyes.  You can definitely tell when the polarization is out of alignment.  Four stars just for this reason.
2961083
I have a small face and these sunglasses fit me really well.  I wear them mostly while biking.  I've only had them for a week, and I noticed the surfaces of the lenses seem to scuff easily, but that doesn't seem to interfere with clarity (yet).
2245503
I'm still giving 4 stars despite the lenses having popped out on multiple occasions. It's annoying but fixable. Perhaps I'm just not a savvy enough buyer, but they're still worth every penny considering they're polarized and have a dark enough tint to do what sunglasses are supposed to do. If there's a better option for cheaper, let me know.
52405
Ok, in order...

The Bad: Very light-weight, cheap-feeling. Of course, these ARE cheap, so complaining about that is inane. They also fit a bit snugly at the temple, pressing into the side of my head right above the center of my ear. Hasn't caused me any headaches, took a couple of days to get adjusted to the new fit (vs. my previous pair, different brand).
These glasses sit very close on the face, something that might influence some people.

The Ugly: Back to that cheap feeling... These things feel really fragile. To test my observation I attempted to change the lenses, which other reviewers outlined as a risky proposition. Honestly, I like the look of these things so I was careful; moved slowly, didn't try to force any elements in weird directions and I was patient. Took me about 90 seconds to dislodge the comes-with lenses and set them aside, another minute to install the lenses in the picture.

The Good: I love dark glasses. When I was young, for a very brief time, I had a pair of sunglasses that used welder's glass as the lenses. They were stolen after a while, but it set a standard that I always try to find again. When I put these on, I want darkness to claim the land. (yeah, I'm a little evil)
These lenses are DARK. My wife says she can't even see indoors when she tried them on, and this is precisely what I want in my lenses.
So I'm very pleased with these sunglasses. I may buy a secondary pair "just in case."
4504567
Took a few RTFM cycles before I figured out to retract the focus screw, place the base notch on the lock button, and set the feet, but once I got it to settle in place, it was stable enough.
Once I stopped using the wrong glasses it just required a slow hand on the focuser and some slight head movements to find the dust on the surface.
4045978
Pro: The clip does a good job of shading my eyes and the lenses are large enough they cover my glasses appropriately.
Con: It doesn't quite fit my frame as perfectly formed as I would have liked, but I'm not sure you're going to find that via online if at all.

Pro: It also was steadily secured such that it didn't vibrate or wiggle around much while I was running in my couple outings with it.  (Other clips some times are looser or less secure such that you can hear and see it rattle around while you work out.)
Con: Because it's secured at the center only, if you push up or down on one lens inadvertently it can stay at that skew until you fix it.  (Other Clips that  secure at sides don't experience this.)
1094846
These came in an almost too tiny pouch, which had them bent a bit awkwardly, but I was able to straighten them out. I have a wide face for a girl, so these suited me just fine. I wouldn't recommend them for smaller frames. They do seem to be a bit too flat, not slightly rounded as sunglasses usually are, and sit out from my face more than I'd like. Perhaps I need to work on shaping them a bit more. They are light and comfortable. The color is nice. Plus, they came with a bonus cleaning cloth.
1534
The lenses are good, clear, and the polarization makes everything sharp. They are not, however, a perfect fit. The are loose in my frames, but it's only noticeable when cleaning the lenses. When cleaning, they move around, and if there are any loose strings, like on a towel, they will get caught between the lenses and frame.

They are also loose enough to pop out of the frame, if enough pressure is applied, and it didn't take that much.
906281
Not as adjustable as you'd expect; pretty much just minor orientation changes in the position shown; can't flip up out of the way for parking. Mirrors are convex. Overall pretty satifisfied
3453440
It's not perfect, but for the price I really can't complain.
719634
While it was easy to install, you do get what you paid for.

It isn't perfectly uniform convex (like the stock mirror), so it does produce some excessive warping at the edges. But really I don't use this for reading billboards or checking people out. For everyday driving use it does the job and does it well.
2127977
The optical quality of these isn't the best, and they do feel like they would break if mishandled just a little, but so far so good.  They have been through 3 movies.  I do have to hold my head at a certain angle in order to obtain the best viewing though.  Can't turn my head at all or the 3D effect is lost.  Since I need my glasses in order to see, there are worse options than these clip-ons.  (glasses over glasses is NOT do-able in my opinion)
1995701
I bought these as eye protection for soap making and they work/fit very well.  The lens is a little dark for indoors, but it's not too bad.
2636554
Lenses don't fit 100% in frame as there's a tiny gap in one of the corners, but they do keep in place.
Lens quality seems to be ok, not bad, but not like the original.
3784246
good lenses but the frame is little crooked. as in it is pushing my nose from the left side more than the other side