Matsuuras are very well built machines. The company is still in business, their offices are in St. Paul MN. If I were looking to buy used Matsuuras I'd call them to see what the spare parts situation was for the machines. Methods Machine Tools (Sudbury MA) may also have some spare parts left for these machines, has been selling them for 30% - 50% less than Matsuura to try and move them out.
I would be more concerned about the control than I would about the machine. Yaskawa Electric no longer supports the I-80 controls or drives. There are a few companies out there doing a good job of repairing these but who knows how long their supply of parts will last.
Hope this helps.