I use the big spools of Maxi lock thread to piece the quilts together and sometimes I have quilted small Lap quilts with the same thread but using the variegated kind.
I built a spool holder for the large spools out in my studio but I have devised a way of making them fit on my machines without the spool holder. Looks funny seeing a Singer 66 with a HUGE spool of thread sitting there but it works and I do not have to change spools out for an entire quilt.
But mainly I use the C&C machine quilting thread for the quilting part because I bought so much of it on sale (50% off) and after I clear them out I am going to Connecting Threads and buy from them.
Billy