Not having a tablet, I have no actual experience trying to play a song off of one, but it seems like the screen is too small -- I find that I need to be creative with my use of space to fit most songs on a full 8.5x11 sheet or a long one on two. A pedal seems like it could make it work well -- but does the software do a good enough job of reading your mind to actually scroll the right amount without having to devote too much attention to it? I sometimes find getting a PDF to scroll where I want it to intrusive while I'm just reading on the screen.

Or maybe I'm making excuses, since I have lots of songs that aren't in my computerized book in the state that I want them, but do I ever do anything to fix that? Naah.