Prior to purchasing S3D I used the free Pronterface software to debug and query my printer. S3D's Machine Control Panel provides basically the same capability, but it much less convenient to use. Here are some suggestions that would make it a lot better:
1. Fix the bug that loses macro names input by the user.
2. Add a button to stop scrolling the Communication window; this would enable easy copy/past functions for data shown in the window
3. Add the 2 - 3 more rows of user defined macros
4. Move the function for defining/editing macros from the Firmware Configuration dialog to the Machine Control Panel.