The service is still in private beta but anyone can launch a demo session and get a good feel for the UX. Also, 100 of the first invitation requests from HN will be granted as soon we get them. At this point only a subset of the planned functionality has been implemented but the minimal viable product is there I think. We've been working on this for a few months now. Mostly we're looking for high-quality feedback and we expect our best shot at that is the HN community, which has been a major source for insight and inspiration for us during development. Thanks in advance for taking a look. Hope you find this useful!