I was an Oakley user but got tired of the frames cracking every year or so. Then there was the time that some guy took me out in a crit and the M-series lens cut the crap out of my face (true story - I have the scar to show for it!). I don't blame the glasses per say but they do have a sharp corner as at the bottom edge where the lens curves around the cheek bone.
The last few years I've been using Bolle Vigillante's; picked up two pairs with interchangeable lenses for $75 from Performance. So far they have been great! Frames are holding up well and the optics are fine. They sit a little farther off the face than the Oakley’s but I've come to appreciate that for obvious reasons.
Ed