Hiya Brian,
What do you plan to use it for? For vinyl cutting or contour cutting edge prints? Do you already own another Gerber plotter?
If it's in good working condition, you have the software to run it, and it comes with all the standard accessories, then yes, it's probably a good deal. Like Gino said, they're workhorses and require very little maintenance.
The only issue I had with it was the cutting width. At a former employers shop, we got the HS 15 to replace an older sprint cutter. If I remember correctly, the sprint could cut up to 13.25" of a roll width, but the HS 15 could only cut 13". The problem was that we had a lot of repeat orders that required us to cut at 13.25". So, every time we ran into a file that needed to be downsized, we cussed that plotter.
Checkers