I own one of these. It’s a very good mattress in terms of firmness and comfort. It’s not your typical PVC mattress, it’s made of coated rip-stop nylon. It basically doesn’t stretch the way the other air beds do. So you don’t start out firm at night and wake up sagging in the morning. You can make it almost too firm.
There’s only one draw back for me: It makes a fair bit of noise. There’s a crinkly noise if you move about a lot. Like the sound of a potato chip bag (maybe not quite that loud, but that’s the gist of it).
Anyway, it works as advertised and there’s a few youtube clips out there reviewing it if you want to see it in action:
This one’s in Russian, (I think) but it’s good because you can hear the noise the fabric makes: