Nutanix Acropolis

Im curious what the community opinion is on the Nutanix hypervisor in terms of bleeding edge performance, stability, availability, usability and support?

Im in an unusual situation where Ill need to install Acropolis to replace a large and already proven KVM/ESXi datacenter cluster.

This datacenter literally saves lives and so there is no room for learning what the major failings of this product are later.