I have had an HQ 16 for about 6-7 years now, and absolutely love it. I know the Sweet 16 is the bare bones machine, but not really sure what that is anymore. I have a stitch regulator on mine, and never quilt without it. My friend never uses her's, so I think it's really what you become a custom to. I never have tension issues that a few adjustments can't fix, and it runs any kind of thread I have put in it beautifully. (even metallics) HQ has great customer support which counts for a lot in my book. I would ask around to see if there is a repairman in your area. That would be my biggest concern with any machine purchase. Babylock now carries the Jewel, which is made by HQ, so if you have a Babylock dealer nearby, they should be able to repair and maintain it for you.