I bought these at REI (one of their "retail partners") about a year ago and they had been serving me well. I liked these sunglasses because they were comfortable, light, polarized, *seemed* sturdy, came with a very sturdy case, they look cool, came with an extra pair of lenses in a small microfiber sac that you can use to clean the lenses, and an extra pair of sports band temples (basically temples with a permanent adjustable elsastic band to keep the glasses on your head when you're active). Unfortunately, I recently tried to change the temples using the provided "interchange key" and the temple snapped at the "Gator-Lok" point. There was barely any force applied (I followed the instructions) and it just snapped. It worked the first time I tried it but this time, it broke! For $120, they should be much more sturdy than that.
Well, at least they have a lifetime warranty. I'll just get free replacement temples, or so I thought. So I go on their website and found out that it costs $30 for a "processing fee". Oh well, not so bad really. $30 isn't going to break me but I feel like I shouldn't have to pay at all. Just thought they should be more sturdy. It also says that you need proof of purchase (PoP). However, in the FAQs, they state that they grant a one-time exception if you lost PoP. When they send it back, you will be given a new UPC code for PoP for future claims (hmmmm.....are they expecting future claims?)
I really liked these glasses but I'm not sure that I would buy them again. For that kind of money, they shouldn't break so easily. It's possible I got a bum pair or even that I attempted the exchange incorrectly (but I don't think so). Good luck.