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I did get a chance last night to test further. Not ideal conditions - pointing out of garage door with moderate light pollution.
I compared the ES 14mm to a Panoptic 19mm with respect to resolution. I used Omega Centauri (tucked under the top of roller door - less than full aperture in use) and close stars in Centaurus and Crux. Allowing for the difference in magnification, I believe that the ES was slightly better than the Panoptic - nothing dramatic.
I tried the ES 14mm in a GSO 2x ED barlow and it worked just fine. All I did see was that the barlow enhanced the chromatic aberration seen on very bright stars (Mimosa and Hadar) when they are close to the edge of FOV. Note that they show slight CA in the ES 14mm by itself - but it is out in that last 10-15% of the FOV.
The weight of the ES14mm and barlow was considerable. I didn't hear the focusser groan, however, and my counterweight approach balanced the tube.
I tried the ES 14mm in the Paracorr and I thought the view wasn't improved much (f5 scope) at all settings of the Paracorr. I am happy with the ES 14mm by itself.
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