When in H.S, I went through a lot of cheap SG's..
Lost them, sat on them etc
After I lost my first pair of expensize ray bans, I got real careful with them.
Now, I buy expensive Optic quality oakleys and a good hard case. Most last for several years before I buy a new pair due to growing tired of them.
I can't stand wearing cheap plastic sunglasses and with my light colored eyes in Fl, I wear them always outdoors.