I have a Viking purchased new in 1977 and I sew a lot. I have taken it in most every year for service and it is still going strong. Two years ago I got a newer machine with a large harp area so I don't use my Viking as much. I have already had my new machine cleaned and tuned up once. I clean it good regularly too. I believe in regular maintenance will extend the life and quality of stitching on a machine. I take my car in for regular maintenance too. I never have had a problem with my machines. My Featherweight machines I service myself because they are easy to do with regular oiling, cleaning and lube about once a year.