I've mounted the Cygolite 150 on the seat pocket loop for the moment as I have no other place for it. But here is the problem I see with it, it is too bright. Blindingly bright. I wouldn't want to follow behind one of those, even in the daylight. At least it lets you turn it way down, as that's how I'll probably use it. But if that's how I'll use it then I didn't need a 150. So as a review I'd give it a 3, just too bright to be used as full capacity. Add that to my super bright tactical flashlight I'm using and I'll just light up the streets. And yet I feel safe on my other bike with my MagnicLight rear light and B&M Cyo Premium headlight, neither of which are light cannons but do the job very well and are always on.