I can imagine that the whole body language/body weight distribution differences must be really weird to adapt to compared to a regular bike. I'm sure that it will retain its value over time simply from a curio aspect. I dont remember the engine sound, I imagine it has an old beemer airhead sound to it? and bike movement when you blip, like with shaft beemers? Ive only ridden old bmw's a few times, last time was decades ago, a 900 I think.
You really don't notice the movement since it is sitting on three wheels, that and the fact it has a whopping 42 ft. lbs. of torque.