NOTE: Original purchase NOT from Amazon, however, these are the best glasses I've ever owned.<br />I have worn the same pair of polarized Predator 2 glasses exclusively for more than ten years straight---same single pair of glasses.That should tell you something about the quality of the glass, frames, and hardware. I recommend you also get a pair of Croakies or Chums and hang these shades around your neck when you're not wearing them and yours can last that long as well. That way you're less likely to set them down somewhere and have them disappear. Also hang from my rearview mirror when not in use or hanging around my neck. AlI of these things have helped me to neither lose nor sit upon them.<br />I work in HVAC industry and these glasses have stood the test of time and abuse, and they are great on a bright, hot roof. The lenses only just began showing minor scratches after about the first 7-8 years.<br />I have only worn Ray Bans with glass lenses because they provide a clear and true picture and don't distort vision. I find that my vision becomes distorted if I wear cheap glasses with cruddy polycarbonate lenses. There may be some manufacturer out there with decent poly lenses, but I've not yet found one which I like.<br />I will soon purchase these again, and I will most likely be purchasing these from Amazon, as the price is slightly lower than what I paid retail at &#34;Sungla$$es Hut&#34; ten long years ago.