I used my blue bobbin case for the first time...I did something wrong...now my bobbin will not move. My husband bought it to the dealers yesterday. I have FMQ'd with out it with no issue...not sure if I am going to use the blue bobbin case again...its a pain to unscrew the plate. It worked great without it so unless there is really a huge difference I will skip it in the future. - I did find using Quilting needles were very helpful, made a huge difference. I just use the auto tension and keep the dogfeed up.