I'm attaching a photo taken with the aid of CamRanger, using LiveView, focused with touching the subject on my iPad. My real delight is this focus technique, where I can choose a focusing point remotely while watching my scene on my iPad. Then, the battery drain becomes a hindrance. I exhausted a fully charged Canon battery on my 5D3 in about an hour while on LiveView. Consider an AC adaptor to power the camera if AC is available, or, an external battery adaptor if unavailable. Another "point" I worry is the heat generated by the sensor while on LiveView. I have been judious on using LiveView because of these two factors.
I'd like to read other's comment on a useful product.