The idea is great but unfortunately the technology behind it is limiting. Since their highest pricing plan only allows for 10 simultaneous viewers it's not realistic option to embed it in a popular blog as a demo.
The pricing plans we've put up so far are definitely intended for agencies / dev shops that want to share apps-in-progress with clients. We know there's a lot more we could do with this, though - we're just waiting for everyone to tell us what they want before we add new pricing :-)
