I thinks the reviewers below are expecting it to do too much. It is a simple tool - all that is advertised is that it will take an nrg file and make an iso file.

The procedure is very simple - just open up the app, pick the extract location, and drag an nrg file to the window. Having done this, the app duly made an iso file for me, however the file was unreadable by both the Disk Utility and by Toast. Too bad, this was almost a great little app.