Grabbed one online since my local Aldi didn't have any on the shelf.
The chair is quite close to the ground, the seat being about 2/3 knee height and top of the back about waist height. The good news is it's a really wide seat and with the arms on it could hold in a lot of mess for someone to sit in. And being close to the ground someone could really splat down into it too. Not sure if it'll work as an inflatable slide when placed upside down (something I'll test out), could also be great for bending a model over for one beautiful pie target.
Easy to inflate, and the no-return in the valves form a very good seal. Although the main chamber takes a larger nozzle than the side chambers. For deflating stick a hair pin or cotter pin in the valve (opens the no-return) and use a hoover to fully suck the air out.
(Just a heads up people are also selling them on eBay for £20 (or higher) too)