A complex plugin like this needs sufficient support. This is clearly not the case with WPeC. A great potential completely wasted. Unless you are a developer yourself, I'd stay far far away from this rather shoddy platform. Nobody ever gets back to you unless you pay for premium support. The community is regularly fuming. There's no passion to deliver something that really works.
It's better to charge for a plugin and give free support, then to make it free and leave people with a half hearted product and zero help. I can only hope that somebody with the ambition to deliver a good product will take over soon.