Canon Speedlite 580EX II Flash Review

I upgraded from a 420EX to this 580EX II. I got it just in time for a wedding photo shoot, and I must say I was NOT disappointed.
First, its battery life is outstanding. I shot shot more than 650 photos with the flash, most of them bouncing off the tall ceiling, with only ONE set of 4 AA batteries.
Compared to the 420EX, the advantages are huge. The recycling time is amazingly fast. It reminded me of the time the shutted lag difference I noticed when I switched from a compact digital camera to a digital SLR! You can even burst the flash for half a dozen of exposures (bounced off ceiling!) in 2 seconds (interesting for the garter throw!), to match the speed of the Canon 20D or 30D.
The quality of the TTL exposures is also singificantly better than what I would get with the 420EX. 95% of my shots were spot on, using full TTL mode. It is consistently excellent.
The fact that you only need to press one button to move the head of the flash in all directions was what sold me on the 580. What a pleasure to be able to switch from landscape to portrait and still be able to bounce the flash! This simple operation took 3+ seconds on the 420, and only 1 second on this one, which is the difference between getting the shot or missing it (or just giving up trying to get a vertical shot with the flash). The light reflector is also a nice feature, to get a catchlight in your subjects' eyes. However, it won't work if you shoot in portrait mode (will reflect off to the right side).
But the ONE feature that is worth the upgrade alone is the hot shoes quick release mount. Just slide the lever to the right, it clips right into position and is securely mounted on the hot shoe. It is of course just as easy to unmount the flash.
One other very nice feature is the direct access to "second curtain flash", simply by pressing a button on the flash. No need to go wandering into the Cn functions of the camera body!
On the down side, the flash is a lot bigger and bulkier than the 420EX, although not that much heavier. It is a little more difficult to fit it in my camera bag now. It is longer, wider and deeper. The only way to really be able to tell is to have it in your hands. Comparative photos won't really do a good job at showing the difference in size. That said, I had it mounted on my camera the whole day, for more than 8 hours, and it never bothered me.
I haven't even scratched the surface of everything that this flash can do, manual mode, etc, since I got it 2 days before the wedding and didn't have time to explore its features. I can't compare it to the 580EX mark I either, since I am coming from the 420. But if you're in the market to upgrade your flash, don't look twice, and get the mark II right away.
To sum things up, I would say that this flash is worth every penny, and well worth the price premium compared to the 420EX. It beats it hands down in every single category, has an outstanding battery life, and is completely silent (I forgot to mention that). I am not a professional, just an enthusiast, but I can definitely justify its cost, at my level. In other words, you don't need to pair it to a 5D or a 1D Mark III to notice how much better than the 420EX it performs.
See more reviews about: Canon Speedlite 580EX II Flash for Canon EOS Digital SLR Cameras