So have had the SON/Luxos U/TopLight Brake Pulse combo installed for about two weeks now and I have to say I really like it. The dynamo resistance is unnoticeable to me while riding.

The amount of light that that the Luxos U throws is just obscene. I mean really it might be TOO bright. The tail light comparatively is modest in brightness and works as advertised although I cant seem to figure how to activate the standlight even though I am sure it is wired correctly.

Overall it was a great upgrade and one I will make to any non-superlight racer bike I own in the future.

I will put some photos and maybe a video together this week.