I'm curious what the stitch regulator does. I think I've read that it's found only on the Bernina.
Also, I had no idea that plastic parts could be such a problem when I bought my two Brothers. The first one does have a problem, I think maybe it's the timing - it jumps a stitch every so often - and the second one works well, I really like it, but the plastic bobbin makes a lot of noise.
I'm assuming when they say plastic parts are not good for quilting they mean the actual end portion, quilting the layers. I don't think I could ever do that anyway. I don't have any strength in my fingers.