I have not used the 580 EX II extensively and so cannot list much, though I have noticed the weatherproof rubbers provided all around; definitely a very good feature.
On the couple of occasions that I've used the flash, I have got under exposed images and had to compensate by 2 to 3 stops to get satisfactory exposures. Has anyone faced this problem? Will be glad to hear from them.
Canon India though has been prompt in replying to my mail on this issue and have asked me to send my 5D & the 580 EX II to them for checks; but before I do would appreciate some feedback on this issue... Thanks