Box that has all the features that one would expect from a flashgun. I have not tested all the functions but on my D5000 represents an essential accessory for a large party of my photos (fill in the shadows on the outdoor portraits mainly) Coupled with YN-622N, it allows me to do off-camera flash pictures without being dependent on the built-in flash with TTL metering.
I recommend it to anyone who wants to invest in a flash. This opens new possibilities for creativity and really boost image quality.