That may be so, but that's also pretty much it. Then again, for that price you could buy an Amiga 500 and a synth :D
(amusingly, Ensoniq was founded by ex Commodore/MOS engineers, including Bob Yannes, who created the SID chip found in the C64)
> File System Translators - it could read and write all sorts of disk formats.
Just like the Amiga. There's dozens of filesystem implementations for the Amiga - you just drop a device file in the right directory, and add a very simple configuration.
There's even at least one editor (FrexxEd) that exposed it's currently open buffers as files in a filesystem (so you can e.g. run your compiler directly on the editors buffer without going via a temp file, and have the compiler output go directly to another buffer, without any explicit support in the editor)
Also, the OS had some neat stuff like File System Translators - it could read and write all sorts of disk formats.