I'm a wedding photographer by profession. I put off buying this because it was so expensive and I was doing just fine carrying extra batteries and changing them when I noticed they were running low. I purchased it the other day because I was getting sick of missing 1 or 2 out of 5 pictures in quick-sequence shots (bouquet-tossing, cake cutting, etc).
After just one shoot, I have completely fallen in love with it. I was able to fire off sequences without missing anything, it recycles my flash supremely quickly and I only wish I'd bought it sooner. I will actually be getting rid of my 430ex backup flash so that I have two flashes that are compatible with this.
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