In reply to Robin.

If I were making the decision, I personally left the other options and returned to BuddyPress. Here is the thing. Though this one seems quite nice and has features which are similar in functionality to major social networking platforms (familiarity is important to users), BuddyPress has extensions which have been created which are free and will give the functionality the paid plugins for this one are offering.

However, even with that, I would not look away from this project just because they aren't offering everything for free as with what is available for BP. There are drawbacks to BP. But there are less drawbacks than there were a few months ago because of aggressive updates recently.

I would rule out WPS unless you want to be stuck with just what they offer. They aren't very open with regard to extendability. That's a major drawback considering the price they want for everything. And that's the way that project has been for a very long time.

Again, this project is young and what is being offered for download is RC4 which means it isn't really a full release.