From what I can tell, it's an excellent scanner if you're scanning trannies for magazine and advertising work. For larger output, it's not as sharp as some of the other drum scanners out there. Also, for scanning negatives it's not as easy to use as other scanners / software that's out there. Some would call the Heidelberg scanners and software "negative hostile".
That said, I've never actually driven one myself, so all I know is hearsay from people who have, and from postings on forums where drum scanners are discussed.
Do your homework on used drum scanners. Get a fully turn-key system, everything including the mounting station, the software, the computer the software runs on (typically an ancient Mac), and the dongle that activates the software. Everything you need to scan should be included, and I mean everything (because you can't buy it from companies that either are gone or who have exited the scanning biz, like Heidelberg has exited the scanning biz). It should all be one package, or you should walk IMHO. And you should get a demo on it and some instruction if you want.
As to "cheap" the prices of drum scanners are nearing the floor. There's a lot of them being carted to landfills and recycling stations for lack of interest. Make sure you know its real market value before you make a deal.