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I purchased the Canon as an upgrade from my Sigma EF-500 DG Super flashgun. The difference in quality between the two units is immense with the Canon in a totally different league: it is a solidly built unit that immediately inspires confidence whereas the Sigma is flimsy by comparison. It delivers an outstanding performance with highly accurate illumination. It has everything that I need in a flashgun and then some. I'll be keeping the Sigma as a back up and will be using it as a slave from time to time to the Canon master - I was particularly pleased to find that the master/slave relationship works between the two guns.
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