The screenshots (which are inconsistent between the JomSocial addon page and the publisher's page) look nothing like the actual app. The app itself is so spartan, it doesn't even have a module suffix field. Nevermind the polish that is implied by the screenshots. No response to question regarding the module suffix field. But plenty of references in the support forums for "immediate support for paid subscribers". Look, if you're going to put out a "free" app, don't make it so obvious that you are only doing so to get people to give you money. You are wasting our time and most definitely ruined any credibility you have even with your "paid" apps.
tl;dr - PASS ON THIS.