I have been using the solution for 7 years.
Reliability, Flexibility, High Availability; Vmware enables virtual servers to instantly move from 1 physical server to another with no user downtime.
Enables combining many physical servers to a few or one.
The price could be lower.
No issues with deployment.
No issues with stability.
No issues with scalability.
Very good customer service.
Very good technical support.
Yes, we previously used Citrix Xenserver and Microsoft HyperV.
It was straightforward, but you need training first.
We implemented through an in-house vendor team.
1-3 years depending on how many physical servers are eliminated.
Our setup costs/every day costs are several thousand dollars.
Do a pilot / proof of concept first, and test -- take a non-ciritical server, convert it to a virtual server and let it run for a few weeks - then a 2nd, then a 3rd. If it all works, well, then do more