I tried one, since it was a lot lighter than a coil spring or even sponge mattress. Picked up a very expensive one with a built in pump, queen size, rated to hold two people.
Used it a few times, it was always very deflated in the morning.
Also despite having good sheets and a fleece pad between the plastic and myself, I found it very sweaty
It's rolled up in a closet at home now, ready should I have any house guests.