Just picked up a used SB-910 flash and did a quick test drive before learning how to use it. So far I'm happy.
These are with a non-cpu micro 200mm f/4 lens on f/32, programmed into my D750. Flash was put in auto aperture mode and gets lens info from camera. Put the included diffuser on. Hand held.
Camera is in Aperture priority, speed is 1/60, and flash changes power when I rotate the aperture.
Next step is to mount it off camera and try the commander mode.