Yeah but a clamp doesn't always work.
I cant stand it when my guys lose a $2 magnet, I don't know what I would do the first time one of those magically disappeared. I think I'll live with the cheap ones for now.
By the way, if those things are as strong as claimed, it seems that you would put one somewhere and not be able to get it off. Do they have a handle on them for grippageafication?