VMware ESXi is not just an alternative virtualization product to VMware Server but a better choice in terms of functionality and scope of features.
Have you used vpshere software to connect ESX host or is there any other software available too?
We are able to patch our hosts during production hours with the ability to keep services running.
The vMotion in particular I think is the most valuable because this feature provides migrations of virtual machines in case you want to run do maintenance.
The free ESXi hypervisor was a great way to get started, as it allowed us to introduce virtual machines so that users could start to experience the advantages.
It has allowed us to be more resilient to infrastructure and hardware failure, reduced hardware costs, and decreased recovery time from failures.
The most valuable feature is the VDP Backup solution.
The ability of a running VM to be quickly relocated to another hypervisor or launched at another site via replicated storage greatly reduces downtime.
Its DR facility is good. Within a moment, data can be retrieve from another physical location over the Internet. The speed to recover data is good.