Thanks, dunster. That is a very enlightening post. I will print and save that.
I have the BSR and learned to FMQ with it on my Bernina 440QE. I have tried to do it without the BSR a few times, but it was a disaster. Yes, sometimes I move so fast that the BSR cannot keep up with me, but most times it does just fine. I tried meanders of different sizes and was amazed at how easy it was and how nice it looked, even if I did cross over the threads a few times.