It's not perfect, but it's damn good and getting better all the time. 5 stars for recreating so much of the Vimperator experience, for the thoughtful workarounds on the constraints imposed by the new Firefox APIs and for the continual improvement.
Coming from pentadactyl, I am feeling very comfortable with this addon. Most keys are the same. Considering the technical hurdles, you have done a terrific job. This is really life changing - thank you so much !