DCTV was great- I remember using it on a CSPPC-060 and it was fast. Please note that with with large amounts of data onsreen it tended to slow down a bit. There was a progream fro the folks that created asim cd filesystem that allowed you to playback any IFF animation off of a hard drive instead of loading it into ram. So the possibilities were pretty cool for the hardware. I still have mine, even though I've sold all but my amiga 500...
I used it for scenic video displays...
With $39 dvd players that can playback divx, jpegs and video files, the dctv setup is actually more expensive to run than off the shelf hardware.
I used to do 24 bit paintwork for my photoshop class becuase the Macs at my University were always booked and Photoshop 2.0 (at the time) was SLOWWWWWW on early PPC Macs... I had to use a A2000 with an A2630 accelarator to get my assignments done. Later I swithced to the Emplant and a Retina card...I would go back and forth between PS 2.5 and DCTV paint and Brilliance.
You can also render lightwave animations to the DCTV format. Did this with an A3000 040 machine that was on 24/7 rendering animations.
Good luck!
M