I have two, an RER and a Dryad. I see nothing that would convince me to go back to a working limb recurve. The statics out perform, are quieter, and have less finger pinch. The RER grip fits me almost as well as my Kanati and both shoot the same arrow setup to the same point of aim, although the RER is 10 FPS faster and one pound heavier in draw weight. My creaky old shoulders like that I can shoot 10 ggp arrows at 184 fps from a 47 pound bow as well.
Static limbs are certainly not a new idea, but we are rediscovering why the old bowyers like Grumley saw in them. My RER is not and will not be for sale.