I have a Flak Jacket XLJ with these lenses. I'm really impressed with how the prescription came out. The optics are superior to my normal glasses (less distortion and chromatic aberration). I have a good tolerance to bright light so I was nervous about the polarization on the lenses making everything look too dark based on the specs (the non polarized is 18% vs 10% for the polarized). In practice, the polarization doesn't really make the lens any darker. It just reduces glare. They should be perfectly usable on overcast days.

The lenses also came with an AR coating on the back, which was a nice bonus I wasn't expecting.

I wrote a review in the standard column on these babies. With prescription, I have mine in the XLJ version on a pair of metallic red Half Jackets, this is the best sunglasses you could ask for. Warm,beautiful tone and practically no glare. Bravo!