Hi.
I was using this before I had to return it for an SB600, so I had tested it for about 10 days. No CLS to play around with, but was attracted by the high GN and small size.
I returned it (2 pcs in within 10 days) because it was constantly underexposing, or should I say under-flashing. Not a problem with the GN or body settings as all permutations etc were trialled. I think it just does not "talk" properly with the body, to work out the proper amount of light as it should.
This should be an obvious observation, IMHO, general quality for build etc is lower that original Nikon SBs, batter hatch does not close flush when all the batts are in place with a gap of approx 2mm!
Gone back to Nikon SBs and not regretted it.