I have them and have been using them for close to a year now. It has 2 frames(one black and one silver) and 5 pairs of lenses with a carrying case. Its quite durable, got mine as buy 1 take one for 2,495 IIRC(comes down to 1,247.50/box). Its value for money but some bogs here don't think so as they keep breaking them.:grin: In my experience its even more durable than some Oakley models as I've had 1 (not the M-frames, forgot the model) that just snapped as the frame became brittle. The lenses(GE Lexan, I think) are also good as I've experienced some backsplatter(from shooting at plates) that didn't damage them. If you're not too fashion and brand conscious, you won't go wrong with it.
I started a thread about this last year. Here's the link to Mojave Convertibles