This product looks the part and the kids certainly love to play with it (big fight over who got to sleep in it as well!). In my opinion though it doesn't seem to be very comfy to lie on - the mattress is ribbed and the ribs seem to dig into your back, saying that it might be different for a 15kg kid.
Inflating the bed is easy - about two minutes of pumping on the supplied foot pump and you're there. No problems with air escaping when you screw the plug back in either thanks to non return valve (although this makes it a bit of a pain when it comes to deflating the product).
All in all three stars.