I got given one (well two) of those vests and have been wearing one at night.
Did a little test the other night ...
You know those portable speed displays they have around the place, without the vest the bike doesn't seem to register on them, with the vest it only flashes "SLOW DOWN", maybe I was going to fast 
I only did it a couple of times as the people started to look at me funny (and probably called the cops) so is only a very basic test. Might try it again once the weather clears.
hmm maybe flashing lights might work better ... stick on one my helmet ...
We childproofed our homes, but they are still getting in.
Bookmarks