Well, I'd definitely try it out first, which is much more valuable than some random person's opinion on a forum. I imagine that those without imagination will say get rid of it, but I'd certainly try it out if it's useful for you.
But $800? It's worth like $150, $200 tops in mint condition. I just picked up a Yamaha RM800 24 channel 8 bus board for $350. Mixers like that are going for a song on Craigslist.