... I started using Sunnies back in 2005 and always kite with them since, the only time I don't is when I have broken them or they have come off in a prang. Infact I just about can't kite without them.
Little story, I got my first set which were Blue Eyes brand I thinkm (now using Seaspecs), and only had them a week and didn't really like the way the spots of salt/spray got in the way til one run, minding my own buisness, I happen to spot in the corner of my eye what I thought was a piece of chop and BANG!! I got hit square in the eye, or rather the left lens by a flying fish. That f@#king thing surely would have taken my eye out had I not been using the sunnies so from then on, I haven't gone a day without them.
The spots/salt etc don't bother me now, I occasionally just stop and wipe them down and carry on!
Another benifit I found wearing sunnies is when kiting in monsoonal rain, or when kiting straight into the sun around sunset time which I do often.
On the polarized or non polarized, I'm on the polarized only team.
cheers,
Robbie