I've about made my mind up to search for a 15-91 Singer after hearing such good things about them. I already have a FW a 66 and a 99, plus a Janome 6600P which I just bought the blue bobbin holder for free motion quilting. That worked fine for me this last week, but I find my heart still yearning for the 15-91, but I just read on here somewhere that the bobbin runs out pretty fast when free motion quilting, and wonder if this is a real concern. These bobbins look like they would hold the same amount of thread as my other machines, but I haven't actually seen one in person. The additional machine to do the fmq with would have been my justification for getting one. All the other machines piece just great, and I love them all. Soooo my question is do you find your bobbins run out when using this to free motion quilt on???? Thanks for your input....Love this board and all the "smart" people on here.