Received my Arsenal this week for my D850. At first, it took about 4 attemps to update the firmware before success. Then, when I tried to use it in single shot Smart Mode, it would focus, but then say 'camera error'. Later that day I tried again, and it worked fine. I have say it does get a good WB setting and produce good image. My problem now is when using a mode with multi exposures like exposure bracketing (HDR) or long exposure mode which simulates a long exposure by taking multiple shots and combining, Arsenal is supposed to assemble the final shot and then write a DNG file to your cameras card. This just isn't happening, even though I get a preview of the final image via the app on my phone. Have now threatened to return it for a full refund. Not only because it's not doing everything, but I find their 'support' too slow to respond.