I was scouring craigslist for a decent tig machine. I came across a Miller Econo Twin HF unit. Its old, but in perfect working condition. Its a ac/dc machine and will run on household voltage. The most i could find was the manual on Millers website, it looks and sounds like a good machine, i'll use it for steel mostly, some aluminum projects. Should I pick this up for 500 or just save my money and pick up a newer machine?

Thanks guys.