I definitely use one. In fact, I think I'm going to get a 1/4" one, also. I think it would help on bindings and I have a hard time keeping the 1/4" seam using the walking foot I have.
Don't use one - don't own one. My machine (Viking Platinum) does just fine without it. Binding; the odd occassion I do machine quilting, etc. Never had a problem.