I have a Blinder 4V and I love the light that it produces, but I don't like much else about it. The flip out USB charger is a pain in the rump, I have to unplug other stuff to get it in to my computer. The battery is the shortest lived one of any light that I own, and the mounting really only works for one thing, the seat post. There's no way to use it on any of the normal places I put lights, like on the rack, my helmet, or my bag.

I just relegated it to living on my road bike in the summer in case I get caught out after dark.