Which kind of crib bumpers are safe?

I just wanted to see if anybody had any thoughts on whether or not to use crib bumpers? I did not like the mesh bumpers and tried a product called Wonder Bumpers. So far they are awesome, has any other new parents tried them? I love the simplicity of the product, they are pads that zip up the crib bars and leave no room for infant injury or suffocation. Just wanted to see if anybody else likes their Wonder Bumpers . . . . . .