I wouldn't call them a waste of money ..but it should would be a waste to throw them away with the filter. There's another outfit that uses a ball instead of a bar.
The
Filtermag offers more benefits ..especially at SEMA 2007
I have a FilterMag and it works great, and yes I do see stuff stuck to the cans of my filters like in the pictures on their website. I don't catch as much as they show, but there is enough that I feel it makes a difference!

I promised someone on here I would post pictures of my next filter for them to see.