Hey Gunner, I was a factory Emco service engineer for a few years and also worked on them after that with a distributor. I just looked the 420 up and it is as I supected based on the 425 platform. Any info you want reguarding the machine look up references to the 425. only difference will be the control which is now a 840d rather than an 810. I have a LOT of experience with the 425. Overall it is not a bad machine, It has it's quirks like any other. It is not a beast, it does well with medium to light work. This machine is an air hog, feed it well, I would reccomend an at minimum 10 gal. air tank an accumulator prior the lathe. With all the mechanical crap going on you need to use a warm-up program to get everything settled in if you are doing high precision work. I can dance in an 810 but the 840d is a control I have limited experience with. for a programer the control should be a dream. From a maintenance standpoint I did not get enough experience with it to have any usefull feedback. The Seimens motors and drives are great, one of my favorites from a service point of view. If you have any direct questions about the base machine tool please feel free to contact me as I know a considerable amount about it having to go through the debugging process of a new modle at the time. I hope this helps some.