Right now I am working with my Janome that I purchased in the mid 1980's. I just had it in the shop for cleaning and minor repair. I also recently did the same with one of my FW machines. I used it the whole time the Janome was out of service. the next one to go in the shop will be the Juki for cleaning and timing issues. When it comes back I will use it as my primary machine as I am partial to it. I have 13 different machines here and only one is not in working order. I change machines just because I want to keep all of them working well especially my vintage machines. So the primary machine depends more on my mood than anything else. Service is the key as to when I change.