Authorize.net CIM exension - anybody use?

We are migrating to OpenCart and need a payment gateway that supports Authorize.net CIM, which we are also migrating to. We want the extension to store customer CC info with authorize.net and return a card token, which we will charge later, usually the next day.

Does anybody use the Authorize.net CIM marketplace extension here by GelGel? Or know of another? I haven't gotten a response from comments posted or email sent. I'm uncomfortable going with software if there is no support going forward. Does it work? Support issues?

Thanks!