Mario Monti , Sep 01, 2006; 09:44 p.m.
I never liked using flash.
Never until I took two courses with a great teacher.
I own a 20D and two 580EX flashes and have borrowed a third.
It is truly amazing what you can do with Canon's TTL system.
He has been photographing for over 30 years and has been using the Canon TTL system since introduced in the 80's.
He no longer uses his studio strobes and hasn't for about 1.5 years.
From what I've seen, he easily has 5-6 550/580 flashes.
Although most of us can't afford or justify that many, he in a pro.
He likes the fact that he went from a van load of equipment to carry around to something he can carry all in one trip.
I vote for the 550/580/430 flashes if you can afford to. I'm glad I did...
Just my 2 cents...