Built like a brick. Recycle time. Locking, quick-release hot-shoe clip.
Cons:
None that I have found.
I upgraded from the Sigma EF500 Super...which is a pretty decent flash.
The 580EX II is a great flash. Very powerful, solid construction (compared to the Sigma), and I love the locking, quick-release hot-shoe clip. Works great on my 40D.
