That's kinda what I was getting at, the 250EX has the options I need ( 10 to 90 AC Balance and pulse at 500 PPs )

From bits and pieces being said about the EXT, it has limited ac balance and pulsing compared to the EX. If the EXT's have independent electrode negative and positive amperage controls, that would be a plus.

When will the EXT specs be on the website???????