I tried this one with my 12" Dobsonian. It was quite a challenge due to bad seeing conditions (clouds dissolved after a shower, but cirrus clouds approaching at the horizon, NELM at zenith was 6.5).
Altogether, I spent 30 minutes at the eyepiece, waiting for brief periods of better seeing like when observing planets. I switched back and forth between 275x and 505x magnification. 505x turned out to be empty magnification. At first, I only saw an elongated and diffuse patch. But again and again I was able to see something shaped like the number "eight", so I couldn't resolve them completely under these conditions. I should definitely try again!
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