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John, the ED stands for 'Extra-low Dispersion' which means less chromatic abberations (the blue-red fringing) on the edge of objects.
The 2 I imagine is just a version 2 of a previous range.
Running it through David Green's eyepiece calculator gives...
Exit pupil - 0.65mm.
Magnification - 230x.
True FOV - 0.24 deg.
I've read not to go below 0.50mm exit pupil, which on your scope equates to 300x mag (sorry about the 360x before, was thinking of my own scope), and anything above 400x requires excellent & rare seeing conditions.
Those figures should give you Jupiter & it's four main moons nicely in the field of view without pushing magnification of seeing conditions too hard.
As for value for money or quality of the EP I can't say, never having used one.
Hope that helps.
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