While many different people have their own views, I prefer to get fewer of better quality (eyepieces, Barlow/Powermate etc.)...that way my family can salvage at least something from my estate when I kick...
I've not used the 3x ED GSO Barlow...I do have a 2.5 Powermate and like it!...
Depending on your eyepiece spread and equipment, you might consider the 2x 2inch Powermate...I beleive it comes with a 1.25 inch adaptor...this would enable you to use 2 inch eyepieces in the future if you so desired...just my 2 cents...
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