I'm saddened to hear so many people giving up on their BSRs. I think they are a great tool, and they do work. It does take some problem solving sometimes, and some adjustment to how you work. But in my experience, most of the times I've had trouble with my BSR (not all, but most) it has been something I was forgetting to do, an error I made, a poor thread choice -- all things that fall under operator error.
I had one quilt where I got very frustrated with skips along seams in the piecing, and on that particular quilt, my better option was to do free motion quilting without the BSR to to turn my motor speed way down.
RST