She is a beauty! My Elna Supermatic has a wonderful "Elna Growl" and no it doesn't have any flat spots or anything else wrong with it. She sews perfectly and just has this awesome growl. I cleaned and repaired her, hubby helped with the electrical so we know she is in great shape.
The only really quiet machines I have are the Necchi Supernovas and my Bernina 740 Favorit. All of my other machines have their own sounds to them, some much louder than others with my Elna having the most unique sound.