I don't own a K1600GT (I ride a R1200RT), but I have ridden many hundreds of miles with a riding buddy who purchased a 1600GT about three months ago. When he is riding behind me on a sunny day, the bike is practically invisible. The halo lighting around the high beams is very dim, nothing like what BMW uses on the cars and SUVs, and the adaptive headlight might as well be pointing at the front tire. Perhaps if the headlight was a lower color temperature, i.e., more yellow, it would show up better. I think this is a safety issue, and I think BMW realizes this, because the 2013 GT will have the auxiliary lighting of the GTL; whether stock or extra-cost option, I don't know. My friend added some PIAA lights down on the forks, and that made a huge difference. He also tried running with the high beams on, but found that was a little too annoying to oncoming traffic.