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I use my barlow when I do not have a usable EP that gives me a magnification close to what I'd get with the Barlow + existing EP.
On the downside: my Orion Shorty Plus Barlow (which is said to be pretty much as good as they get until you get into Powermates) decreases contrast, introduces some glare and stray light/reflections. The edge of the field of view seems a little bit "light polluted" (there is significant scattered light beyond the edge of field). Although the Shorty Plus is an apochromatic Barlow, it still seems to introduce some false colour on bright objects.
A Barlow increases eye relief, so long ER EPs become quite uncomfortable for me, but a barlowed short eye relief EP (like a 9mm Plossl) is more comfy barlowed.
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