Quote:
Originally Posted by Sh0eBoX 
i'm debating picking up an external flash (looking at the Sigma EF-500 DG Super). anybody here have this flash? I'm looking at either this or the 430EX (don't need the power of the 580EX, and it's too pricey). the EF-500 DG Super has more features than the 430EX, but a poorer build from what i've read. I don't even know if i'll use it that much, as i don't really take enough pictures as it is (when i'm not on vacation and whatnot) but for $150 it's almost hard to pass by 
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The Sigma 500DG Super was my first external flash unit. I absolutely loved it. To have the freedom of a flash you can swivel and point introduces countless opportunities into your photography, and honestly, any flash with swivel/bounce is better than no flash.
I later picked up a 430EX to use as a slave flash. When I realized I didn't really need two flash units, I had to choose between the two and ended up selling the Sigma. Why? While the Sigma is more powerful, the 430EX is enough to cover most lighting applications, and in those situations where the 430EX wouldn't be able to handle, like trying to bounce in a ballroom, the Sigma wouldn't do much better. Also, the Sigma does feature master mode, which is important if you are using more than one flash, but I didn't need more than one flash so what was the point of having a master. I liked the Canon more because it didn't feel like I was going to break it (the Sigma scared me), it was smaller and more compact, and Canons seem to hold their value better. The 430EX is also ergonomically eons ahead of the Sigma, which had slightly confusing controls and other little nuances that could be pretty annoying, like separate buttons for bounce/swivel.
Anyway, the bottom line is that it doesn't really matter what flash you get. The Sigma is just as capable a unit as the Canon, and vice versa, and either will provide the lighting opportunities that is the magic of a flash unit.
Oh and btw, make sure you pick up the Canon off-camera cord. Just do it.
Good luck!