I don't have any experience with the Delta model, but I have used a Vega lathe duplicator extensively and the Vega duplicator works very well. From looking at the pictures I could find online, the Delta model looks nearly identical to the Vega model. The thing I'd be worried about is the cutter. I don't think anyone sells the Delta duplicator anymore so I don't know about a source for replacement cutters. You could end up in a situation where you had to manufacture your own replacement cutters. The Vega duplicator had a carbide cutter and we managed to wear it out doing production work. One tip I have is that if you get a duplicator, mount it on the back side of your lathe and flip the cutter upside down. No matter how good the duplicator cuts, you will still want to clean some things up by hand at the front of the lathe.