Does the job fast and easily. On my Intel Mac Pro I have had no problems. This free piece of software is the only one for Mac, thus ranks as top value. It is easy to use. Still doesn't handle drag-n-drop, but that's no big deal. You don't often come across .mds and .mdf files, and it's nice not having to use Windows software to create a ISO image file. Highly recomended! Many thanks to the developer!