The G4000 is a pretty good machine after some upgrades. Does the one you're looking at have any upgrades done to it? The QCTP and 4 bolt compound made the machine great. It has plenty of power for the projects I did in Delrin, aluminum, brass, and even tool steel. The disappointment/surprise side of my purchase was in the tool post. It's junk. Upgrade to a Phase II. Also, no reverse feed. If you plan on doing left hand threading, don't buy this machine. If you're considering this against another machine such as the 0768, this machine is heavier and bigger, which in the end is better for most things. Right hand threading is great with the quick change gear box, but speed changes do require shifting the belt and having clearance on the left side of your machine to open the door. If you have more specific questions, ask away! Would I buy it again? Probably so.