Tos przecie podal link gdzie pisze jak wol ze MeiKe nie ma HSSu.

The most significant difference is a lack of high speed sync (HSS/FP Sync) capability in the clone products.

No ale wlacznik i docisk cymes jak oryginal.
No i ciekawonia, ze 580 EXII niedlugo zniknie ze sklepow, zeby 600EX sie zaczelo sprzedawac.

You can already find these copycat speedlights on eBay, both priced around US$180. The real Canon 580EX II and Nikon SB-900, meanwhile, have both been discontinued to make way for their respective successors, the 600EX and SB-910.