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GSO 8" Dob comes with 2" focuser and 1.25" adopter. So you can buy 2" Barlow and use for both 1.25" and 2" eye pieces.
I dont have 2" Bintel (GSO) Barlow so I can't say how good is it. I have 2" Japanese made one and its really good.
I also have TeleVue 1.25" 3x Barlow and its excellent quality but I would advise buying 2x instead because 3x is a bit too much magnification and can be used only when conditions are perfect.
bob
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