[VIDEO]http://www.youtube.com/watch?v=0euR6KxzcH4]Seymour Duncan P-Rails in a Jim Root Tele through EVH 5150 50 watt - YouTube[/VIDEO]
This is a pretty good demonstration of what these things do. After listening to these I find the series option the least appealing. I dig the other three.
I find myself using all four in my cover band