I also have that first-model CamRanger which I bought the moment that it was originally announced.
It's an extremely useful little gadget for all sorts of purposes — including using it as a cable-free "Tether" when shooting for a client who wants to see results during the actual shoot.
This is my walk-about camera-controller:
It lets me set all camera settings remotely from an iPad, fire the shutter and instantly review the result on the iPad; and sync the walk-about flash with any others which are synced to the camera.
You will most probably want to set the camera for RAW +JPG shooting.
My cameras have twin cards so I shoot RAW to one card; and JPG (to be used for the instant Preview on the iPad but later to be trashed) on my second card.
CR will also work from smart phones but I find their screens are too small to be useful for this purpose.