Wow, they seem to be going out of their way to avoid mentioning any benefits I might get from using Zulu over OpenJDK or Oracle JDK for that matter.
Knowing Azul through Cliff Click's excellent blog posts I was expecting to see better GC, scalability work etc. but nope - this just seems to be rebranded JDK that is open source and has Enterprise support. Given Oracle they might have some success but that's about it.