A lot rests on your tolerance for risk and ability to repair things yourself. Having two or three running VMCs is better than one running VMC. Having too much down time for any machine is frustrating at best and potentially disastrous at worst.
A new machine makes sense if there is a company to stand behind the warranty with parts and a dealer who will reliably service the machine. It also makes sense when you can be making money elsewhere in your shop while the service guy is repairing your new machine.
With used equipment, a known history is the best case. Ensure that the manufacturer is still supporting it with parts and tech help via phones. If you have to devote a lot of your own time to service, this may keep you from making money actually making parts. |