Fast response, easy to use, reasonably priced, has great documentation. However, it lacks integration between platforms so if you want to use a separate billing system, you need to have two systems, and it doesn't integrate with the platform you're already using. It's definitely not a complete solution for everyone. In my case, I am already using another system for managing vehicles, but for people who don't have any other system, this may be a nice option. Not very flexible when dealing with multiple companies or organizations (ie, more than one account). Very good at generating invoices though. Also, there seems to be some issues with payment processing as the status of payments change from "Pending" to "Processed", which makes tracking down the problem difficult.
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