I tested the flash on my Canon EOS 7D and am completely satisfied. Above all, the 5-year warranty have moved me to buy the Nissin. Canon is on the Speedlite 430EX II only one year warranty. (I did too) The flash also works in slave mode excellent, is then ignited by the integrated camera flash. Only the operation manual turns out very thin, but you can read the manufacturer's website and download. Nevertheless 5 stars for value.