I haven't heard much about them in reality and I can't answer any of your questions but just looking at their website it looks like a fantastic template of what Communists should be doing. A great example of organising, presented coherently for a modern audience.

• Issues

• Engage Locally

• Find a Campaign

• Join an Event

• Organise With Us

Sure they have more of a critical mass to engage with but we're growing too and I think this is a great example to follow.