Anyone try electronic rust prevention?

[cummins724]

Anyone try this thing? My friend swears by these things. Rust hasn't spread in 5 years on his truck.

http://www.ruststop.net/electronic-rust-prevention.htm

 

[Billysgoat]

This type system has been used on boats for years, don't see why it wouldn't work out of the water.

 

[mhuggler]

I got the CounterAct system but I haven't tried it yet.