This flash is, as far as I can tell, basically a re-branded Sunpak, programmed for Fuji cameras. I bought it as I wanted the bounce facility, something the massively overpriced but cuter-looking EF-X20 flash doesn't have. The flash itself is a nice little unit, just the right size for the XP1 and quite powerful, with reasonable battery life and recycling time. It's decently made with a wide angle diffuser, and EV +/-1 controls.
In the X-pro 1's manual it states this flash is compatible, but I can only really use it in manual mode. The camera fires the flash, but they don't seem to talk to each other to set appropriate auto exposure settings. With the latest 1.11 firmware on the camera, the flash menu setting is blanked out so you have to experiment in manual mode to get correct exposure. Some people on forums have said their XP1 works fine with the EF20, but a lot seem to be having the problem I am. So a firmware fix from Mr Fuji would be nice please.