To each his own, of course, but as far as squinting is concerned, I can see the notes and lyrics better on the ipad because of the crystal clear retina image, and the fact that it is one foot from my face. I couldn't do that with the others without hiding my face to the audience. It extends a foot in and 5 inches above the keys, tilted up, so just a glance down is all I need.

Not saying mine is better,necessarily, but it sure works for me, and my eyesight sure ain't 20/20 anymore, by a long shot.