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