Toecutter, I had looked at this product before and wondered how well it worked. Can you adjust it enough that when you brake mildly hard that it will activate? I would like some LED's for braking all the time, but this looks like a pretty inexpensive solution as long as it works.
Works great, and is adjustable for sensitivity as there's a mercury switch and you can tweak the angle depending on how much decelleration you want before it activates. I put mine on upside down, so it activates whenever the brake light is on. I figure it's also a good thing to be as visible as possible while waiting (in gear, and watching) for cars to stop behind me at intersections.
I'm also curious as to where you mounted yours.
I mounted mine under the Givi top box mounting base, as high up as possible. It would go above the license frame pretty easily for those without a similar setup to mine.