An important point for me was the Blitzaufladezeit. In several tests it has already been highlighted (the predecessor YN-568) is positive, with about 3 seconds at full flash output. And this positive impression I could directly confirm. Compared to my previous flashes Speedlite this is definitely one of the fastest and can keep up (not at full flash output) without any problems at burst mode the Canon 6D.
The functions (different modes, power control, zoom settings, sounds, lights or synchronization options) can be easily reached by the clearly labeled buttons and the flash display. The interaction with the Canon 6D working properly, so that all settings can be operated from the camera. Zoom and iris adjustment is recognized by lightning.
Operation with the camera is very useful especially for the settings of the wireless flashing. Here different groups and each group flash output can be controlled. The unleashed flashes work with the Nissin i40 (as digital slave) without any problems. Unfortunately, we were unable to set up the wireless connection with a YN-622C transceiver (and the flash as a master).
Overall a neat processed, very extensive, powerful and fast flash at an excellent price.
Therefore, I can recommend the flash definitely.