Anyone tried the Tifosi, more specifically the GT (golf/tennis) lenses? Most frames seem to have interchangeable lenses, not a bad thing either i suppose. Just wondering about the optical quality and the GT specific lenses. I'm aware that many use the Bolle glasses, but I'm more inclined to purchase the Tifosi's as the are better looking (to me) and I like the interchangeable/replaceable lens capability. They are also cheaper, on most occasions it seems. Thanks.