The Avi Vantage Platform has given us a remarkable return on our investment with regards to the functionality and support of the product. Their support and engineering teams deliver with great consistency and are a click away. One of the biggest advantage has been the ability for developers to create and manage their virtual services (load balanced applications) on their own, doing so through the UI or API, allowing for automation in our environment to be adopted much sooner.
The only difficult part is supporting internally if you aren't familiar with load balancer configuration. The integration with OpenStack can be a bit complex, not to setup but to troubleshoot if there are issues, which are usually scale related in our environment.
The biggest benefit is the ability to use the API to build, configure, and tear down virtual services. As an integral part of a CI/CD pipeline, Avi has worked tirelessly to provide functionality and performance.