I have both the 430EX and the 580EX. The 580 most certainly has more power and more range... but it sucks batteries like no tomorrow. I often find myself using the 430EX when I don't need that extra power to save my battery life.
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My Camera - Canon 40D & 50D
My Lenses - 50mm 1.2, 28-135mm, 70-200mm f4, 24-70mm 2.8, 100mm 2.8
My Software - Photoshop CS4, Lightroom 3, Noiseware
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