I use my 40 yo Viking Turissa everyday, for everything from quilts to blue jeans to wedding gowns. I can service it, too, when it needs adjustment of any kind.
Right now, I also have the use of a nice new Bernina, and it's fun to play with, but it feels so flimsy compared to my solid old machine. And if it weren't working perfectly, I wouldn't be able to do a thing to fix it. It would have to go to a "professional". :roll: