We are a direct partner of formerly 128T, which is now Juniper. For Juniper, we are currently working on the correct partner status, which is missing due to the purchase of 128T.
As a German ISP, we use SSRs to produce SD-WAN deployments for our customers for plenty of different use cases, such as inter-location connectivity, over bandwidth bundling, and application SLA requirements where some applications get threaded differently against each other. So, it depends on the customer, but we are currently using it for all of the use cases for which you can use SSR.