Never before have used the external flash, but have to say that it meets all my requirements so far. Easy to get good cards. Footwork all too often "tavern images" as photo genre is probably no direct demanding branch but I'm still happy. Also photographed little wedding party as well is about the same criterion above. The choice was between this and Nissin Di446 but i40 with its high guide number and the flash head is fully rotatable led me to choose the more expensive variant.
Being able to turn the flash as little as you want is atleast for me many extra points to get good light in the image. Often uses the hood of but rarely reflector card and the integrated diffuser (which really only be used if you wish really wide beam).
However, I have had to replace flash once, do not know what the problem was but sent it back to Dustin and it came with a new record, nothing wrong now.
Some deductions when it is not exactly a cheap flash, nor the most powerful, and to the then given up once. Otherwise, only the tip!