I agree with all of the above, but reserve the right to machine sew down my bindings (both sides). I use a decorative stitch in a thread color matching the binding so the stitches disappear. My quilts are to be used/abused and the edges/bindings get a lot of pulling and tugging so I need them to be strong. Sewing them down by machine will give you that strength. It isn't a "proper quilting technique", but it works for me and I've never had any complaints from recipients.