Support for up to 4TB physical memory, up to 320 Logical Processors, up to 64 nodes cluster which can support 8000 VM's
Supports many types of migration scenarios such as live migration, live storage migration limited by only hardware capability.
Management and Integration:
Lots of management tools, integration with system center makes it a backbone of Microsoft's cloud infrastructure.
Room for Improvement:
Apart from windows and some flavors of Linux, it does not support any other virtual guests.
If your infrastructure is based on MS products then this is a hypervisor to go for. Virtualization of some of the components such as domain controllers are supported by Microsoft only on Hyper- V.