99 and 99k (I don't know the difference, but I have several of each and they all look and sound alike to me) are wonderful little tiny HEAVY machines. Think FW, except for weight. I love all of mine, buttonhole makers, zig zaggers, ruffle, whatever I want to put on them are not any trouble attaching and working without a lot of agony (this usually ruins me when I am in the mood to do something different with a sewing machine today); I love that they are quiet and easy to train a new sewer on.