I started using the big iPad in cockpit and found it definitely too big to mount on a yoke - size and weight wise.
Only after I switched to Mini I fitted a yoke mount and that was almost ok - given the fact that the yoke tilting iPad screen is not optimum, but the only place to put it in a small cockpit. I am now going from iPhone 5S (on RAM Mount on the side) to iPhone 6Plus and already took the iPad Mini yoke mount off, leaving the iPad Mini on the kneeboard as backup only.