Cyber Commander

Product homepage: http://paulcbuff.com/cc.php

Summary

Controls all Buff receivers, I use it with the Einstein 640 units.

• Can address 16 channels/lights
• Built-in flashmeter
• Total control of all E640 functions
• Takes 2x AAA batteries
• Comes with a micro-SD card for storing lighting setups
• Has a 2.5mm mini-jack port if you can't/don't want to trigger the cyber commander via the hotshoe

My own notes

• Pretty easy to get started, though you'll want to read the manual a bit
• Small, very sturdy little unit
• Hinged at the hotshoe so it can stand up or lie down flat. Clicks at 0-15-30-45-60-75-90 degrees
  • I find it has a tendency to fall over and lie flat, but this hardly bothers me, just seems a little meh
• It really sucks if your batteries run out, so carry spares
• Interface isn't bad, uses two 4-way joysticks that can also be pressed inwards for a "click" select action
  • Joystick feel is pretty good, but they're very small so it's possible to mistake a click for a direction sometimes
• I felt the interface could sometimes benefit from having one or two more direct controls, but this is a fairly minor issue

Firing is done through a single, dumb sync pin in the hotshoe, so it's fully compatible with everything ever made. So you can do silly-buggers stuff like this:

Actually, an SB-900 on top of the X100 would look sillier than this.

The only other thing that comes to mind is that the Cyber Commander is really useful as a flashmeter. To that end, Buff recommends/advises that some photographers buy a dedicated CST transmitter for just this purpose (leaving it on the camera to send the final FIRE ZE SHIT signal), while walking around and metering and adjusting with the Cyber Commander. The utility of this method depends on how much you'll be changing the lighting setup throughout the shoot.

The silly alternative to this is to use a couple of pocket wizards, the baseline Plus-II units will do fine:
Camera hotshoe -> Pocketwizard transmitter -> Pocketwizard receiver -> sync-port on the Cyber Commander -> Buff lights