I've been puttering around with various locomotion systems for the HTC Vive at roomscale, and I have to agree that this is the best locomotion system I've seen. It does wonders for immersion, and although I don't personally suffer much from VR sickness, even my most sensitive friends are relatively unaffected, even without comfort settings.
You mentioned plugin development earlier, and that you would be working on a UE plugin first. Is there any kind of update on when a UE plugin would be available?