This really depends on the customers requirements. Manageability, transportation and low footprint (and thus higher consolidation ratio) are ones that are often referred to by customers.
Improvements to My Organization
Central management, easy deployment, easy management. This simplifies IT management processes and cuts on project costs and power/data center costs.
Room for Improvement
Licensing cost together with SA.
Use of Solution
Since ESXi version 3.
Depending on guest OS, there are some issues with controller type/driver versions.
None, if you have the resources you can easily scale out (or up)/down depending on your scalability requirements. Autodeploy, host profiles and customizations are a great help here. Further vCOPS will give you valuable capacity management options.
Customer Service and Technical Support
Customer Service: Great.Technical Support: Excellent.
Straightforward, must have some knowledge though how to implement in the organizations required solution.
I do projects for customers.
Pricing, Setup Cost and Licensing
Not at liberty to share.
Other Solutions Considered
Yes, XenServer and Hyper-V are often evaluated by customers.
Don't be intimidated by all the possible functions and comparison reports out there. Look what is needed for your requirements and match to available editions. Also when looking into costs, take the whole into account (not just initial costs, but also consolidation ratios, managebilty and the returns you get from those.)
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Feb 13 2014