I have a Bernina 1230 and a walking foot.
I'd say the walking foot is really nice to have if you want to quilt with it -- either straight line or wavy line. For that purpose, I think it is worth the money.
I don't bother to use the walking foot for sewing on binding because I don't seem to need it. My Bernina seems to feed well, and the only thing I do is hold the binding slightly taut while I sew. I prefer doing this to using the walking foot because the foot is bulky and not that easy to put on and take off.