CamRanger is an amazing product! I use the CamRanger on my iPad-mini to control my camera which is mounted on a monopod that can go up in the air for 6 meter. (PhotoMast).
I'm shooting a lot of (dance)events, and it is very important that i can change my settings really quickly. Normally i am shooting with a Canon 1Dx and Canon 5D mark 3, but i bought a extra camera (Canon 6D) to use this dedicated on the photomast, together with the CamRanger.