Beads were the worst fucking thing I ever did to my truck. I bought those silly Equal balancers, paid to have that shit put it, then paid to have it vacuumed out a month later. It was just awful. I went back to weights.
Equal isn't beads. It's more of a powder. http://www.tirereview.com/balance-compounds-help-make-tires-a-sound-investment/
This explains the ideas behind all of the types of products available.