A flash that's what he said to be

An amazing flash! as others have said, a clone of Canon 580ex II.
After more than 100 pictures with learning, I'm not disappointed.
In Master it controls other Speedlites e-ttl perfectly, and manual, the trigger too.
In slave it operates as well as Canon.
Mounted on my Canon housings, they recognize him as one of their own and can be configured up to the same depth functions (ie, fn)

For the price of the gadget that is the Canon 230EX II, with this flash you have the equivalent of 580ex II.

I do not agree with the comment of Gourin in the instructions. I find it unclear but, on that side, too, is the same story as flash notices Canon ;-)

Note that it appears to be also usable on Nikon (from the manual) but which have not tested I will say no more.

PS In addition to the ordered product, in the box there was a small pendant that I have hanging on my 70D. Although this pendant is not a commercial value, the gesture was touching and I enjoyed.