I don't think there's such a thing as a perfect 1/4" foot unless you keep
using the same fabric, same thread and press your seams the same way all
the time. The other day I noticed I had to move my needle twice. First,
because I was using fabric from Connecting Threads which is a bit thicker
than Moda (for example), then had to move the needle again when I started
pressing the seams open. Having said that, I still like my 1/4" foot for the
guide. Maybe they should call it guide foot intead of 1/4". ;)