I for about a year now already have the flash on my D7000. It works as it should and has served me well already in many situations (of Wedding and Portrait to concert and party). The reload time is certainly better, especially at high consumption during "Bouncens". But I have been very rarely needs more power. For that I have the little box is always in your pocket, what I do not do with larger flashes. And with the lens are also strong wide-angle to the course. The only drawback for me is that the flash (such as SB 400) is not horizontal swiveling. So that eliminates from the ceiling bounce unfortunately in portrait mode. Between Question: Is there actually a iTTL swivel coupling to interpose? Did not have found ... Since I use Eneloops, it happens that the lightning no longer trips after a trip with fresh batteries. Then he must be removed and turned. This suggests, however, soon again, so I would rather attributed to the batteries.
What would now make me thoughtfully before buying, however, is the rising price. Moreover, costs the Canon version currently only nearly half and the Nikon SB400 only a few euros more. Even if the "original" probably not one whit better, the temptation for the potential customer is certainly large ...