I am a self-admitted addict when it comes to cycling glasses. Radarlocks have been my favorite style, for several reasons. The fit is perfect, they are the lightest weight (and most well-balanced), the frameless (mostly) and single-lens design provides the best field of view, and they fog less than other glasses I own.
I do a lot of early morning rides, and coastal So Cal is typically either foggy, overcast, or you have a bright morning sunrise in your eyes. Or a combination of all of those as the ride progresses. Most of my favorite trails are a combination of shade, canopy, and exposed sunny areas. The soil is light in color and ruts and other hazards can be difficult to identify.
So I went for a pair these, mostly for the Clear Black Iridium Photochromic lens, and also to try the XL style (not these, I realize), which provided an unmatched field of view when I tried them on.
I tend to prefer lenses in the 15-18% range, and these are a 10%-66% lens. They never get too dark for me, but always provide enough coverage. The tint itself is pleasing and comfortable. It also really helps with identifying terrain (I am a mountain biker, but I road ride on my MTB to build my base and to avoid muddy trails in winter).
The bad: I felt like a total spaceman wearing the XLs. Yes, that is a fairly pathetic (and vain) complaint. So I bought these in the standard Radarlock models, and tend to wear them more frequently (again, strictly a vanity issue). The XLs are better glasses, though, just by virtue of the field of view.
All said, if I could only own one pair of cycling glasses, these or the XLs would be the pair. They do it all, and do it well. I am very happy with these, and recommend them highly.
These are the stars in my starting rotation, which right now consists of my TdF Radarlocks with the +Red Iridium lenses, my aforementioned Clear Black Iridium Photochromic XL Straight Stem Radarlocks, and these.