I don't use the 580G lenses anymore even though I love them...my eye doctor gave me a stern lecture and showed me pictures of one of her patients that had a jig come back and hit him in his Costa glass lenses. It shattered and the guys eye was shredded.
Im in 580P lenses now and have never had a single quality control issue with Costa.
I own amphibia (like them)...Oakley and costa. My next pair will be another Costa.