Yes you are right, this is the Nissin DI622. Why of all flashes you say? Because it is relatively cheaper and imho it also out performed other Nikon units on the SB series. If I were to purchase now, it would be this one because it looks promising as there have been news of a new firmware that could be flashed on it making it support remote triggers. It should have been done a long time ago but anyway, this will be mine by hook or by crook LOL!
Oh my I'm losing all my savings on this hobby hahaha!