I had one of those back about 1979, when they were the latest-greatest thing, bloody expensive and sensitive machine way back then. Check out you tube there are bound to be videos, also check Ebay they might just be valuable collectors items by now!
It will find most things, the discriminator sort of works - just need to ignore the needle and really listen to the different sounds it makes, then with practice you get an idea of what you have detected. I used it in all metal mode on gold, I dug everything for a start, actually found a buried car first time out with it! Got pretty good eventually at telling what was under the coil. That's about all I remember about them - it was a long time ago. Can't even remember what happened to mine, probably sold it off back in the 80's.
If I had a choice between the 5000 and some no-name Chinese plastic fantastic, I would go with the the Whites every time. Don't know if that is much help. NUGGY