I have both feet. I've never changed the pressure when using either one, and I've used them both on 3 different Viking models. Having said that, I don't really use them for quilting except attaching the binding. I usually do a faux flange, using the 1/4" guide to attach the binding then the SITD plate to do the final stitching. So all straight stitching and the interchangeable one seems to handle the straight stitching just fine. When I first started using my walking foot (original version), I was taught that you should hold/guide the fabric so there's a small bump of unstitched area in front of the foot. Like there's a small marble under the fabric in front of the foot. This is so there's no drag and the foot can actually do it's thing. I've always used this technique with whichever foot I use.