I think one problem with all the bike-specific lights is they don't have replaceable batteries. I don't know if this light addresses that. but the battery is a wear item and after so many uses it needs to be replaced. In addition it would be good to have spare batteries on longer tours.

I just use flashlights and helmet lights with 18650 batteries for that reason.

That light is large enough to house standard 18650 batteries. Why not use those? This is an expensive light I really want to keep forever, but the battery won't last. if it could have 18650 batteries, I could keep it forever and just replace batteries.

I'm not a fan of the separate battery pack. Too much clutter. Why not just include the batteries in the light and make the light a bit larger? Or not make it larger and use 18650 batteries that I can switch out as I ride. not sure how long the battery would last (3 vs. 6 hours ), but on a long tour it sure is acceptable to stop after 3 hours to switch batteries.

I'm sure it provides good light, but still pricy. A light is an item that can get stolen, or fall down and break. With the fast development of LED there will be a much better light next year, and the year after. So the argument this is an investment and will be good for life is a bit weak in the electronic market in general. I work professionally with building interior and exterior lighting. some years ago LEd was odd and at 70 lm/W. now 120 lm/W is normal and many commercially available lights have over 140 lm/W. for every project I design I have to update data because the fixture line that was on the top 6 months ago now is superseded by a new line or a competing product. There is no "really expensive light you buy now that will be great for many years"