The small paddles fit poorly and result in a mushy non clicking feeling. They actually hit the rubber grip on my elite series 2 core controller. The large paddles fit flawlessly and click perfectly. I am tempted to either add a drop of epoxy to lengthen the bump that hits the button, or to heat them and bend them a bit to avoid the controller case. In the meantime I am only using the large paddles as they are nicer than the ones I 3D printed due to the strength of metal.I've not tried them on an original elite controller. The tolerances may be close enough to work correctly on those.