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Hi Glob,
To throw in my two cents, I have a GSO 2.5x APO barlow which cost me $69 about 6 months ago and a 3x ED GSO barlow which I bought 1 month ago for $49.
The ED one leaves the APO one for dead in my opinion, less colour fringing and much better views. For a cheapie, the 3x ED GSO is very good value. I havent seen any others in action, but these ones I have and thats my findings. Certainly, the quality jump on my Jupiter photos has indicated this from the 2.5 up to the 3x, easier to focus too.
Just thought I would weigh in if it helps.
Chris
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