Indeed, they take up very little space when rolled up, and appear to be solidly-built, albeit expensive.
Problem is, they are very thin and the comfort they can provide is limited: they're OK-ish to seat on, but as full-length cockpit cushions to lay upon (e.g. to take a nap in the cockpit) they are disappointing.
We have them too. The problem is that when used in the advertised automatic inflate/deflate mode, they are too thin when inflated to be particularly comfortable. However, you can 'top-up' the inflation by blowing into them, after which they are very good. We can't be bothered to keep doing this all the time, though, so store them inflated, which rather negates the whole point and cheaper 'permanent' cushions are then probably just as good.