Still generally prefer the shape and design of the Koo Demos for my whopper head, but I find the frame bottom of the Demos to impede vision a bit. That's why I bought the Alibi. Unfortunately the Alibi is a bit narrower across the lenses, and the temple is perhaps a bit short so the glasses want to fall forward and down. Works great with the Kask helmet, much better than other brands. It's better than most and probably ideal if your head doesn't fill a 10 gallon hat.
