I know it won't be long before some idiot decides to steal my chrome valve stem caps so I am thinking of getting those locking valve stem caps. Anybody use these? If so are they any good?

Any feedback would be great.

Oh here is a link if you don't know what I am talking about

http://1licenseplates.com/tire-valve-caps.html

I may be mistaken, but it looks as if all someone would have to do is pull up and turn the cap to get it off....???

I don't think it works like that. You need a special tool to pull them off.