Well, I contacted them about this thread. I have to say that I would like to try one as well. You don't have to worry about purging them either.
It's an interesting concept. It may be a good alternative for those that chose to mount pony bottles and don't want to worry about freeflows from a charged regulator.
If they choose to join the thread, I'd like to offer them some thoughts on their choice of wording in their selling points.