We are currently using it for development, however the last release was Service Bus 1.1 over two years ago.
Should Service Bus for Windows Server be avoided?
Turns out, it is dead now....
https://azure.microsoft.com/en-us/blog/collaboration-and-federation-azure-service-bus-messaging-on-premises-futures/
As a consequence, we are announcing today that we will not provide an immediate successor for the standalone Service Bus for Windows Server 1.1 product. Service Bus for Windows Server 1.1 was shipped as a free download that could be installed inside and outside of the Azure Stack precursor Azure Pack. The product is available as a free download and will go out of mainstream support on January 9, 2018, following the regular Microsoft lifecycle policy as published at the initial product release.