I've seen these earplug devices advertised to equalize the pressure on either side of the eardrum while flying. I have alergies and nearly every week I can feel the pressure changes not only in my ears, but in my sinuses -- it's a really strange feeling when your sinus cavity "pops" like your eardrum normally does. Not painful, but certainly enough to keep me from dozing.

Anyone have experience with these plugs? Do they work as advertised?