I've been using Metz flash units for years with no trouble whatsoever, I wouldn't be surprised if the Sigma units are re-badged other manufacturers units and therefore have less quality control over them. You didn't mention which camera brand you are using, but if it's Nikon or Canon you might be just as well checking their own brand flash units, prices compared to Metz are not all that different if you shop around. I use SB-800 flash units for my Nikons and can honestly say I have yet to find a job they can't accommodate, the build quality goes without saying.
nirofo.
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