I bought my walking foot over a year ago and I just started using it last night. I love it. It works great and I wish I had put it on the machine for straight stitch quilting a long time ago.
The sewing machine that I put it on is one that I use for piecing and other sewing but it does not FMQ. I was wondering, can I leave the walking foot on the machine all the time for regular straight stitch sewing and just remove it when I need the other speciality feet (buttonhole, zipper, etc.)?