We don't charge for product updates - they're included in the price of your software subscription; but the features you have access to will depend upon your plan (Team, Professional, or Enterprise).
We ship regular updates on a weekly basis to add new features, improve performance and fix problems. We apply them automatically for Cloud customers. On-Premise customers will be notified of new updates on the admin interface and can apply them from the OPC when they choose via a one-click process.
See the Product section of our News area to see the features we've added recently.