Well, here's a rather extreme example. Recording of a demo for an a capella quartet, as part of a live show. Quartet needs usable results yesterday, for whatever reason: time presses. Hokay, fine. Showtime, quartet does 4 tunes, then many other acts come on. I print the four tunes in real time on the Masterlink's internal hard disk, slam on my headphones, crop heads and tails, fade audience sounds before and after the songs, reorder the songs the way they want them for the demo (with the Big Finale first), normalize, and render to a finished CD-R *by the end of the show*. They come down after curtain calls, I hand them their finished demo CD-R, pack the mics, and I'm loaded out. They listen to the finished product in the car on the way home.
Could you do that with a DAT deck? Not without other hardware: the DAT is just an intermediate storage format. A standalone CD burner? Not without some external intermediate storage, and not without software support to assemble, manipulate, and burn the data. Would anybody in their right bleedin' mind _want_ to work this way? Gawd, no. If anybody ever asks you to do this, run screaming from the room.
But I've actually done this, with my heart in my throat the whole time, and produced a result that the group was extremely pleased with (and figured was a miracle, in fact). And all I had was 2 mics and an X-Y mount on a stand, a board used only for its preamps, a handful of cables, and this box. No mouse, no Windows, no "mastering processors", no intermediate format to Sneakernet back to the studio, transfer to something else, and slave over for hours. Just the handful of buttons on the front panel of the box, and a blank CD-R.
Will this work for everybody, or apply to every musical style? Hell, no. Even I'd prefer to have reviewed it back at the studio with real monitors before committing it to the disk, rather than simply trusting the mics and the room and the talent and my headphones and my ears to Do The Right Thing. I could probably have made it better. Shoot, I could have loaded the whole wad into Wavelab and screwed around with it for days, as is the modern style. If the group had wanted, I'd happily have reworked it back at the studio. I kept the raw performance on the Masterlink's hard disk, and I actually still have the 24-bit-format backup CDROM of their raw data downstairs. But they are still happy with the near-real-time result, and therefore so am I. This was what this particular job required, and the box turned out to be damned near perfect for it.
It can be used to cut a *lot*of hardware complexity out of the CD-production loop, and not just for blitzkrieg-tempo live work...