So I was looking for some new sunglasses for the summer cycling season. After looking through Oakley, Smith and what have you, I settled for a pair of the Spy Screw. I based this decision on cost / value, exclusivity, and prior ownership of Spy products which I still own today.
The lens quality / optical clarity is superb but not quite as good as Oakley, so keep that in mind but you'd have to be extremely detail oriented to tell the difference. The margin of difference is little to none. I have the Matt Busche edition so the spectra lens does an extremely good job of blocking out sunlight in extreme light conditions (think early to mid afternoon.)
The frame itself is extremely light weight and the Hytrel rubber on the temple and nose piece doesn't slip off even when you're working up a sweat. I love that air flows past the lens and it scoops air through the side vents of the frame so this does live up to it's fog free claim. Realistically, however, if you're stopped, yeah, it'll fog up, but even $300+ Oakley's do this. The moment you get going, the fog disappears within a matter of seconds.
One note - I'm Asian so the original nose piece did not fit me very well. I e-mailed Spy's customer service to see if there was a larger/Asian-fit nose piece and to my surprise, they simply sent to to me - free of charge! How's that for customer service?! For Oakley, you'd have to buy an Asian-fit frame and most of them are gaudy and in the $300 range anyway (way to push the stereotype, Oakley.)
My only gripes - the Screw does not have a polarized option. Would be awesome if they did! If you're looking for a polarized performance pair of sunglasses from Spy, I would suggest the Spy Alpha which comes in a polarized option and looks similar to the Screw. That and the quality of the frame is nowhere near as good as Oakley but hey, unfortunately, you get what you pay for. This does the job for me and I'm happy.