I bought these as a replacement for my flak jackets when they got scratched in the wave pool at Holiday World, Indiana.  I figured for less than $20 I couldn't go wrong, eh?  Oakley OEM replacements ($60 regular / $90 polarized) can be exorbitant and I just wanted something that would get me through.  Needless to say, you get what you pay for.  The quality is subpar.  The first thing you notice is they are thinner.  Quite a bit thinner.  I'm sure they lack the ANSI certification for impact resistance but for the money it's no surprise there.  The second thing is is that they are DARK.  I got the equivalent to what I had, which was the black iridium polarized.  They are indeed polarized.  They also have a much more mirror finish to them, where the Oakley ones are more subtle.  The darkness was a bit hard to live with but the deal breaker were the reflections they introduced while wearing them.  It seems that the knock offs have a ever so slightly different curvature to their lenses where outside light can come in and be reflected inside the lenses.  This is what happens when you reverse engineer something and don't get it right.  If you can imagine 12 o'clock being straight ahead and 9 o'clock straight to your left and 3 o'clock straight to your right, then the glare / reflections would be at the 11:30 and 12:30 positions.  Basically between your eyes where it's most distracting.  I couldn't live with that defect and am sending them back for a refund.<br /><br />On a positive note, and I say positive because I got a good result, a better result than I was expecting, I went on the Oakley website and shopped for different lenses.  Their website is hard to navigate as far as explaining what all the different color tones were best suited for, but I called customer service and they were helpful in answering a lot of my questions.  Apparently I didn't know much about sunglass lenses or all the technology Oakley invests into it but there is an &#34;optimum activity&#34; fordifferent shade colors, polarized and unpolarized.  I schooled myself and there are lenses for baseball, golf, snow skiing, shallow and deep water fishing, cycling, trails, etc.  I thought colors were up to indivdual preferences.  I'm sure some of it is marketing but there is an amazing amount of science that goes into what they do.  I visited the Oakley store at the mall near me and tried on all their different styles and lenses.  Wow!  What a difference compared to this crap!  In the store it was literally night and day (these knock offs being way too dark).  Their lenses are clearly superior.  In the end I went with their newest latest and greatest hi definition optic &#34;Prizm&#34; line which the sales staff said was superior (of course).  It has a rose like tint to it and supposedly increases contrast and viewability for everyday use.  I like them.  I compared them side by side with a pair of Maui Jims I have.  I have always considered Maui Jims to have an excellent picture, and toe to toe, I think I prefer the daily Prizm polarized better.  Of course, the lens replacements lightened my pocket by $110 but let's face it, we buy and wear Oakleys not just for their style, but for their functionality and comfort as well as superior optics.  At least I am reasonably sure with genuine lenses that my eyes are getting the advertised UV and impact protection versus taking a chance among all these various knock offs. Yes, spending a hundred bucks sucks but you get what you pay for, and in the future I am going to insure that I take more precautions to protecting my lenses.  Don't waste your time with these cheap inferior knock offs.