There may be a huge difference in quality between old and newer machines by the same manufacturer. Most of the old sewing machines were excellent no matter what the brand. Newer machines vary wildly in quality from one name to the other, and also can vary greatly in quality within a manufacturer's line.
It's probably best to post the actual model number of a machine to get accurate feedback; otherwise people may be commenting pro and con on machines that were made 50 years apart from each other, or on machines that have a $1,000+ price differential.