Unless you like it a lot I wouldn't spend too much time and effort on it. It has to be a model worth it, and not all of newer vintage machine are. Some are, and you are the one with the machine in front of you. Some models are worth the time and effort it takes to fix them up or hand them in for a full service. I lean towards a bit older machines, I prefer all metal internals, but I accept a few platic gears too because some of my favorite zigzaggers have one or two (like Bernina).