I teach FMQ and use my FW in my class. I do most of my quilting on it. And yes, I sometimes do big quilts. Never had a problem with the machine overheating. I set the stitch length to zero and do not cover my feed dogs. I release all of the pressure on the foot for FMQ, and normalize it for stitching in the ditch. While I have a walking foot, I don't use it.