i personally have one, and it works for me, i definitely sleep better, so yeah it works in principle for me.
The reason you won't really get anyone willing to stick their head out here and say yes it works for me is because you guys are soo damn demeaning, if its a placebo effect then GREAT, who cares?
It must do some good since its been banned from most sporting events ranging from golf to swimming, so yeah maybe the placebo works just TOO well (isn't that just interesting)
A friend of mine told me about kids doing judo, they were fighting one another and someone attached one of the bands onto the losing opponent without him knowing and it gave him more strength and once they removed it there was less strength to give the losing opponent a chance to win the fight.
my 2c