I'd like to know more about cost and performance as well.
Think about it. You can pick one up on the cheap, take it out to an airstrip...hell, to a field, snap the wings on, and take off!
When your done, take the wings off again, toss it in your little trailer, and put it in your garage.
In reality, the thing is not much bigger than a jet ski. (Alright, maybe 50% longer but you see my point)
The only drawback is the fact that it's a single seater. No passengers for you!