There's no more effective musical OCR/editor on the market than
Musitek's SmartScore X. It will accurately turn any clearly printed
sheet music into MIDI files and has extensive notation features.
The only thing I'd like to see improved is the user interface which
is too reliant upon floating and docked toolbars. A nice paned
approach would enhance productivity immensely. I got excellent
results with SmartScore X and the editing features are nearly as
comprehensive as some of the high-end notation programs such as Finale. The
program is available in a variety of less-expensive versions
(including Guitar Edition
Edition), which are discussed in a version comparison
chart on Musitek's web site. My only caveat is that Neuratron's PhotoScore 6
Ultimate does a better job with handwritten music.