I also got my prescription sunglasses from UHS today. My experience is quite good. The frame is Anne Klein, I only need to pay $7 extra for the frame. And then polarized lens PLUS lens copay cost me around $70. I think it's reasonable.
I was also advised to have thinner lens, but I decided not to so that I don't need to pay $60 extra. The glasses turned out ok, not as thick as she described or what I imagined.