Working in a ski shop I get knowledge of products and the freedom to choose at a inconsequential price what I want. Oakley definitly makes the best lens. I have the A-frame, but I also have some other goggles including the Smith Triad and some mid-priced Scotts. The lens in Oakleys gives the best sight (I use the high intesity persimmon sens). Works great in all conditions EXCEPT bright sunlight.
HOWEVER......Oakely A-frames are notorious for fogging, despite anti-fog treatement and venting. They do it to me, and therefore I cannot wear them on days when it is snowing, which is unfortunate b/c that is when I need that grade A, Oakley lens the most.
All in all, I ski about 100 days a year and 90 of those days I use my A-frames. (Although I admit it is also because they are way cuter than my other goggles, and a girl has got to look good.) ;)