Color: Ruby, Gold, Bronze
Easy to pop in and pop out for quick customization, or changing light conditions. It's not switch-lock fast and easy, but non too difficult. The prices aren't so much that you'll break the bank on replacements or for customizing. I switched out the grey for gold on my Burnquist's and it looks great with the 'woody' O icon.
Its very easy to change the lenses. Also, by combining a new rep. lens you can get an entirely new look on your sunglasses. I highly recommend these lenses. :-)
GC replacement lenses are where it's at right now. Many more colors available than listed - such as Ice, G30 Titanium, HI Yellow and Ti Clear. Whether your making your own custom GC, or taking advantage of the large GC lenses to custom cut a lens for another eyewear, these are fantastic!