I was at CES and got to put on their sensor suit with an Oculus Rift. It's the best immersion I've experienced so far. The ability to independently rotate your hands, biceps, and forearms is hugely beneficial.
Because the system isn't based on optical tracking, there are no occlusion issues. The biggest drawback is that it takes a couple minutes to "suit up". They need to devise a way to attach the sensors to you without all the straps. Also, I've heard people report that there can be sensor drift problems. I didn't experience that, though.
Overall, I was super impressed with the experience.
-Matt Sonic / virtualreality.io