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I use a "no name" Barlow, John, that I bought from York Optical in 1996, never gave me an ounce(gram?) of trouble. Just a 2x cemented doublet; Cost me $50 then. No ghosting and does not introduce other abberrations. Tested it against a Meade air-spaced barlow some years back and the only difference was that the Meade barlow gave a slight but noticeable reduction in brightness.
Don't have experience with the Teleview or Orion Barlows though the Teleview may be superior to the Orion (and to mine). Be wary of advertising claims though! The Orion or other cheaper brand Barlows should be perfectly adequate--you could buy the Orion now and get the more expensive Televue later if necessary. Hope this helps and doesn't add to the confusion.
By the way, this is my second attempt at posting a reply. I'll get used to it one day.
Cheers
Malcolm
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