I used an E3 form for a while and did a century or two with it. It wasn't great for me but it was good. It was a bit too narrow for me.

I'm now a believer in Specialized's Body Geometry saddles. I went in and got measured then bought the recommended width Specialized Avatar. It was great and I still use it regularly. A few months later when I wanted a new saddle for another bike, I got a Specialized Phenom. I like that one a lot too.