I have a Viking Designer 1 which I purchased in 2004. It puts in thousands of stitching hours a year, ( work days I sew 3-4 hours, days off I've been known to sew 8-12 hours) still works great. When I bought it I told the dealer I had worn out 3 machines in 10 years, he told me I would never wear out the viking, so far, he's right.
