I have the PIAA Xtream white on my H4 headlight and it is super. Have not yet tried the H3's on the driving lights yet as have not had the need to but want to do a comparrison between stock and PIAA.
One thing I found is over the counter auto lights don't seem to last long at all in motorcycle application. I believe the difference is the antivibration characteristics of the motorcycle rated bulbs, no matter what the brand.
I noticed on the website listed at Rally Lights, the brighter the light the shorter the life. Seems consistant with laws of physics.
