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My suggestion is don't buy another TV Barlow (I own two) instead get a TV Powermate. When looking at an image, in the back of my mind I always "know" when I'm using a Barlow, but that isn't the case with a Powermate.
I have astigmatism, so most low power eyepieces I can't really assess well. But even to my lousy eyesight I notice that the stars seem to be sharper and the contrast better in the more expensive eyepieces - much nicer - though in actual usage it doesn't make that much practical difference to me.
With higher power eyepieces where astigmatism isn't a problem, a lot depended on my telescope. I recollect buying what was supposed to be a really good orthoscopic eyepiece and not seeing any real difference compared to my standard plossl in my then C8 and 80mm ED refractor. I scratched my head about it, and then tried barlowing my little refractor up to 200X and looking at Jupiter. And sure enough, at the extreme high power for the refractor, the orthoscopic was showing somewhat more detail than the plossl (I could see a shadow transit easily with the orthoscopic, which was much sharper and better defined than in the Plossl).
Anyhow, that's my perspective, but I know that people with better vision see things differently.
Regards,
Renato
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