I have had my S16 for a couple of years now. I really, really like it! I tried long arms, but I missed the feel of fabric under my hands. The S16 will do big quilts, but is more hands-on, which I like. There is a learning curve if you are only used to modern electronic machines. The HQ is more like a vintage machine that takes a big of fussing with to use lots of different threads, but I have used everything from metallics to 30 weight cotton to multiple 40 weight polyesters and cottons. You just have to plan on some get-acquainted time with it.
Pam