Hi,
Not a lot of usable space from what I can see on the few adverts I looked up, but at just over $10k it could be a very handy get away.
We did look at the folding Avans when deciding on what we wanted, but they seemed very 'Ken and Barby' rather than practical and robust, and were soon crossed of our list.
However that is not to say that they could be very usable in the right circumstances.
cheers