Fun seeing this posted - I'm the creator of the project. While it's meant to be a generic IDE/ATAPI emulator the two main use cases I envisioned for the project are in the area of retro computing: CD-ROM under MS-DOS and Windows 9x, where software-only virtual drive emulation options are lacking or nonexistent, and IDE hard drive emulation on early IDE machines where the drive geometries are fixed.

Since the project has been announced, lots of people have come out of the woodwork with other fun potential use cases, such as CD-ROM replacement in arcade cabinets and the Dreamcast, and hard drive replacement in multitrack recorders and samplers.