Well, I have the rooted Nook Color and it's pretty small. The hubby has a 7" Samsung Galaxy Tab for work. It's enough larger that I have no trouble seeing things with my old eyes on the Galaxy Tab...lol. The iPad is larger yet and is the perfect size for my eyes. Then  hubby has his own Asus 10" tablet. It's about the same screen size as my iPad, there's just a bit more of it.

Laurie