I've had several pairs of M frames and previous flavors of Oakley's. Still have a like-new M frame but I've never really been happy with them. As noted above, they tend to push the ear muffs away from the head, which isn't ideal if you shoot Open. I also find them rather fragile, but that might just be me. Also ESS Ice, S&W, JT, and others with varying results. I finally bought a set of Rudy's just this past November with photochromic clear lenses through Double Tap (Josko). It was a very good decision.