ccInvoices and cciDEAL Platform are very stable!
Good news if you were waiting for stable version of ccInvoices (Joomla! invoicing) or cciDEAL Platform.
I have added a short message to their product pages to reflect that these extensions are very stable, but we still need to update the demo videos which mention that these extensions are still in beta. But you can absolutely purchase, download and use the current version on production websites.
You might even like the new functionality you encounter when using ccInvoices, which is also not listed on the product page yet.