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One person found this helpful
Durability concerns (4 of the 6 I own have died)
on June 24, 2016
When they are working, they are superb, but I have had significant reliability issues on the 6 of these I own. At this point, 4 of the 6 do not function at all, and one is looking like its on its way out.
Apart from the durability issues, I find these flashes to be excellent. The focus assist is quick and accurate, the flash tethering is exceptional and convenient, and the controls, while complex, are easy to master. The flash is powerful and the light beam is nice and clean. The construction is pretty rugged.
But, at $500 a pop, having 4 flashes fail in 2 years is unacceptable. I am in the process of working with Canon to determine what may be causing this issue. My guess is undetected overheating that is compromising the circuitry - but I'm no electronics pro.