Well, my personal thinking is along the lines that if some idiot doesn't see that very bright, very large stock tail light on the zuk, then they sure as hell ain't gonna notice a little strip of lights on the back of my helmet. I personally think the Back Off XP is a better mod for your money... that's why I bought and installed one on my bike.
I had looked into this when I was researching what bike to buy. They use the 3m tape to stick on. I may still do it. That giant light in the back is down low. With this on your head someone who is scanning more than one car ahead could see you brake from a few cars back....
Its a thought, but most of our dangers are cutting in front of us.
PS, if you have a normal brake light, you order the special replacement that will activate it wirelessly. With out LED's we would order the little clip that goes onto the brake wire.
I still have a link if anyone needs it I think