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Well, it's a personal thing, but a good-quality Barlow should NOT (noticeably) affect image quality, and it preserves ER.
I have a 2.5x TV PowerMate that I use regularly for my high-power work. It is essentially invisible, parfocal across EPs, and pairs up with my 16, 11 and 9 mm Naglers beautifully (I don't generally use it on my 24 Panoptic). As such, I have no need to go any shorter on my EP FL thanks to the PowerMate. It is also useful for planetary imaging!
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