I have a Bernina and there are two 1/4" feet for it, one with a guide and one without. I have them both. Bernina feeds the fabric perfectly and makes a great stitch but is no different from other machines when it comes to perfect 1/4" seams. I have to use a self made guide on my Bernina just like all the other machines I have.
I use very thin thread in my bobbin, nothing under 60wt. That makes a big difference.