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While GS barlows are good general purpose bits of kit, don't spend the money on Teleview or Pentax eyepieces and then tag them up with a GS barlow. The Orion would be the lower end of the barlows I would look at. The better a barlow the better chance of successfully doubling your eyepiece collection, even if your original eyepieces are budget ones a better barlow will not degrade the image as much.
Better to use what you have in the short term and save a bit longer for better quality optics in the long run.
Cheers
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