Hi Frank, my eyes are probably older than yours, so the size and quality of the sheet music is important. I use MusicReader. Most of my files are printed from Sibelius or Microsoft Word. I like the annotations I can make in MusicReader, the playlists that are so easy to create, and using the AirTurn footswitch you can easily turn pages or even half pages.

The 4.0 release is pretty stable at this time, although there are still some wrinkles. Track record says those will be ironed out shortly, but meanwhile I have made the change 100% from MusicPad. Although I loved the MusicPad, using the MR on he iPad is better!