I just got home from playing "Hairspray". I have my music scanned in PDF format and in "ForScore" on my iPad. I use a holder for my iPad on a mic stand and "AirTurn" foot pedal for page turning. It all works great. I don't need to deal with a music stand, stand light and I have my hands on the bass all the time. It's like any other kind of tool, you do have to do a little practicing with it to get comfortable, but its very easy.
This is the 3rd show I've done with the music on iPad and I don't think I'll go back to book and light. I also have all my etude books on the iPad, also a tuner, metronome and various synthesizers. During breaks in rehearsals I can read the New York Times, and check email. The iPad is one of the best tools I own.