I bought this to use my off-camera flash with my Fuji X-E3. I am impressed with the build quality which I feel is on par with my Canon flashes. Although I plan to use OCF flash, I put it on camera to test and all functions worked perfectly. Then I put it in slave mode. I really like that the LCD panel changes color to red to give you a quick indication of the mode. I turned on the beep which is a good indicator that the flash is overcharged. Controlling with the Xpro-F couldn't be easier and I tested the device in both TTL and manual modes. Exposure was also perfect when shooting with High Speed Sync (HSS). I plan to expand my ambient portrait system by adding an AD200 and using it as a secondary/back light.