Over the past 10 years I’ve owned Costa’s along with the majority of my fishing buddies. I started off with the plastic lenses and finally switched 3 years ago to glass. There is a significant difference in clarity and polarization with upgrade to glass. Worth every penny! The glass lenses tend to be more scratch resistant than the poly. If you are a fisherman, spend the extra coin on glass you will not be disappointed.
Fantails fit me the best and I have the green mirror lenses for freshwater fishing and outdoor applications (golf driving) and the dark mirror blue for super bright days.
I must say I religiously wear my glasses whenever I am outside or driving. That being said I have had issues throughout the years. Nose pieces coming off (seems to be fixed with the new version) and finishes peeling. I attribute the finishing problems to sunscreen. The best part about Costa is their lifetime replacement. You ship them back and $15 processing fee and 90% of the time I would receive an entirely new pair with new lenses (even with new cases). It does take a few weeks but a nice perk to ownership
If you have poly lenses, you can ship your glasses in and upgrade to glass for a reasonable price.
If you are purchasing I did notice that Groupon has tons of Costa’s at low low prices.