Thanks Larry,
I don't think I would buy them but I was curious about what they were. The ED appellation usually comes with a bigger price tag.
I was in half a mind to try the GSO 2.5x ED Barlow out of curiousity though, since I only like barlows for quick, brief, high mag looks at solar system objects when I have the crazy thought that I want to see something at a mad magnification (so I can experience the joy of what it would feel like to own one of those scopes they advertise: 575x magnification!)
Trevor