Having owned multiple pairs of Maui Jim, Costas, and Revo.
When you put on the right your vision turns to 200k Extreme-HiDef.
The most important thing is durability of the frame and then of the lenses.
Polarization is also important!
I'm looking for HD vision and glass lenses, unless there's something better.
1)Revo -- great frames and amazing lenses
2)Maui Jims -- poor frames, great lenses but lacking durability
6)Costas -- lenses are ok, frames are bulky