I kept running into the problem of suspended accounts for non-payment, this module allows my customers to keep the payment cycle running and has completely stopped that hassle. I would also recommend it because it will stop the requests to change the billing cycle when they can do it themselves "of course under the rules you set". One small problem I'm having with the module is that the "On" indicator (green) is not all the way across the word: On"--> "please fix that!"
I have tried several others, and this one is the best! The GUI is simple and easy to use, not to mention it has a lot of gateways to choose from. A few other SMS sellers charge additional fees to add your preferred gateway but with this one "its a good chance yours is already listed." If you are looking for quality and great customer service "this is it - right here"!
The customer support is really awesome, they are quick to reply back, very helpful!