skeptical at first, but now fully convinced

Operating on the EOS 50D without any problems. Is recognized by the action immediately and can also be easily configured.
Flash output is great, very fast rescue.
Hi-Speed ​​Syncro funzt super (so you can actually even similar with 1/800 trigger)
Syncro also on the second "curtain" possible.

Please note that this flash is not suitable as a slave.
I use it as a master in conjunction with a Canon 430EX and a Yongnuo YN-560 Mark III.
Even the operation via Yongnuo RF-603 / C3 Funkauslöser goes smoothly.

Note for the "commissioning"
When unfolded light diffuser flash will automatically go into the wide-angle 14mm and can not switch manually using the zoom button,. (E-TTL and M mode). I thought at first that the zoom function would be defective, but is by design. After shove the light diffuser all automatic programs are available again.

Price / performance better than the hammer; if I could I would give even 6 star