We have the black one at my gym
I've never used it but I know its there (and I'll have to give it a try one of these days...)
I checked their website and you're right - it doesn't have any weight limit information on the inflatable version listed on their website. You might try sending them an email (their site has a 'contact' page) or going to a store that carries it, like Target, to see if it comes with an info sheet containing a weight limit. that IS annoying that the company doesn't mention a weight limit on the inflatable version though!