Definitely true (the Segway is a great example of this), but I've also talked to people who were involved in developing the technology academically and have studied their patents in-depth, and I'm pretty certain they're the real deal.
Recently on the voices of vr podcast, Dr. Thomas Furness mentioned that he also tried it, and it was based off his (Human Interface Technology Lab)'s virtual retinal display technology/patent. I'm guessing this is what you're referring to?
