Stock, Amber, Mirror, Smoke, and BE Profiler lenses.
Well, these lenses, like the plain one, don't fog and are rounded.
Price, and like all lenses, they scratch
Well, I've used the Amber, Smoke, Mirror and clear lenses. I like the amber for cloudy days as it tends to bring out detail a little more (like with Ski goggles). I prefer the mirror over the smoke for playing in the sun, since I think it looks a little cooler. Otherwise, these lenses are basically the same as the stock clear lens, which makes them excellent. I've also put Lens Flyz on these lenses by cutting the sticker into two parts with a ragged cut (contact me if you want a picture) to cut add camoflauge and to cut down on sunlight. It's a lot of work to do so, and they only last about a season, however, so I've stopped doing that.
Personally, I like having a variety of lenses for a variety of situations, especially since with V-Force masks it takes literally 10 seconds to change your lens out.