My first impression of the 900 just out of the box, it is heavier than my 800, much heavier and bigger. I like the manual switch for on, off, remote and master (command). That alone makes it more user friendly. I had to look through the user's manual (page F-10) to see how future firmware would be loaded. It is interesting that firmware will be loaded through the camera, such as D3 and D700 or compatible cameras. Batteries have been loaded, now I need to read the rest of the manual, then try it out on my D3 and my F6. I will show results on future threads. The digital and technical age of photography. I love it.