The flash unit is super for this price. I purchased the flash for my Fuji, X10 and X20 and there's still working properly. Of course, the camera must be switched to manual mode and one has to know what you do with aperture and ISO. At ISO 100 and aperture 1.8 good illumination of a room to 16 square meters with the Fuji. The flash of many cameras does not work is because the lower contact at a voltage of about 160 volts (measured against battery minus pole) applied and newer cameras with about 5 volts at the hotshoe work and have a protective circuit.
I've tested the flash unit to the following cameras:
The flash works on: Fuji X10 Fuji X20 Petri (old camera from the 70s)
Flash does not work on: Canon EOS 1100D, 60D Nikon P7000