I have run Hella Micro DE Xenons on this and my last ST machine (and my headlights are modulated as well, which was one reason I removed the HID conversions I have) - Unlike Bungie I feel that they are competent, but do NOT fry the fur off the forest rats nor do they evaporate the bugs before they hit the shield.
All joking aside, I think I've come up with a few great tests for a set of lights effectiveness.
1: Run at night with your aux lighting going, if you can, for at least 10 minutes or so. Then, shut everything off leaving just your low beams. If it feels like your running totally blind, your lights are doing a good job.
2: If your aux lights are on and thumbing the high beams makes little or no difference, your lights are doing a good job.
3: If your running up a multi-lane highway and cars (or other bikes) come up behind you and DON'T pass you, your lights are doing a good job.
4: While running your aux lights, if white reflective signs hurt your eyes, or yellow signs turn nearly green, your lights are doing a good job.