After 1 1/2 months of waiting (I live in the Marquesas in French Polynesia), arrived this morning my flash is not working. No flash on my 5D2 and 5D3: The flash is not recognized "flash INCONSISTENT" appears in my menu. But I also have problems with its wireless system YN622C where he is unable to have a flash forward more than 15 seconds (all new batteries). By cons with my Canon 430EX II, everything is OK, including with the system YONGNUO Wireless. I asked for a return to recommend a new .... I wait .... Grrrrrrr with impatience! ;-)