Another opinion.

A 12.2" All in one for $227 at WalMart.

I paid $336 at Brandsmart for my Ipad Air 2. That is a $109 difference. At a setting of 60% brightness my aging eyes have no problem reading notes or lyrics. In a horizontal position the notes and lyrics increase in size. And scroll down the screen automatically.

My opinion: I do not want my screen to get any larger. The smaller the screen the more of me and my audience. If I was playing classical music in my home I would use a 24” TV.\ connected to my keyboard.
My motto; K.I.S.S.

John C.
PS, I have a friend who places his Ipad Air 2 flat on the right side of his keyboard so he has full view of who he is playing for. I’m gonna try that.