I have used Oakley Flak Jacket XLJ and Asian Fit Jawbones extensively. I switched to the PivLock V2 Max for the frameless design. The field of view is significantly improved when in the drops while cycling. The lack of a top frame makes looking up the road much easier when your head is down. The light weight design is effectively unnoticeable when running. Fit is excellent and comparable/better than Asian Fit Oakley's. Optics are extremely crisp and changing lenses is easy. I'm a little concerned about the durability of the securing mechanism for the temples to the lenses in that I suppose they could wear out if you change lenses very frequently, but I have not experienced any problems so far. I am extremely satisfied with these sunglasses.