To me, I feel the higher the GN the better it would be - more spark as and when needed (esp for bouncing up high ceilings or reaching far walls or overcoming intense backlightings).
Currently converted my flash collection to 2 58AM to complement my 1 existing Minolta 5600HS, now using Gary Fong's Lightsphere Universal.
I NEVER, use a flash without any form of diffusing. :nono:
well im now stuck with a choice over which diffuser to use for my flash : Lightsphere? Whaletail? DIY ABBC? or Demb Flip-it? :dunno: