It works like a charm for me aswell, really smooth and great to use.
EDIT: I can't seem to get it right it's either too sensitve or not enough.
EDIT2: Here are my settings: pastebin.com/dkECKkCt , it has no deadzone so reactivity is increased and you won't get stuck in a single axis anymore, it should be lightly sensitive to create a "natural" headbob when still. It uses accela as a filter and F11 key for Centering.