The flash corresponds to the data sheet. Power to go, good light distribution. Simple and effective E.TTL II. Keys slightly soft commands, but this is only the first impression, then we are ready more attention. The shoe is very robust, and locks easily. Too bad we can position itself as a master flash, but we know before buying! I do not regret my choice, flash inspires confidence with its performance and print quality manufacturing it releases. This is the Canon, it's good! I recommend this to my best friend flash.