I was searching for a viral marketing tool and parainvite was looking great. nice design and interesting features.
But at the moment I purchased it I realized very fast that this was a wrong decision. The extension is not fully working (many problems) and support doesn't exist there. Forum is dead and support tickets you get no answer or after 1 week with one line which for sure doesn't help.
Probably they don't have time to support their extension because they have to count their money from people like me who are really disappointed. But they didn't care... I'm using lots of commercial joomla products but I NEVER had such a bad support - if I'd burn my money in the fire this would have been better than purchasing this addon. Keep your fingers away from this!
We have just released version 3.5, which uses services' APIs and OAuth to import contacts and send invites securely. All previous problems related to OpenInviter have been resolved.