Most of all, depends upon your environment.
Improvements to My Organization
It has improved the way our organization functions in terms of visualization, simplicity, manageability, and support.
Room for Improvement
Areas for improvement include other Security Features like AntiVirus, AntiSpam, DLP etc.
Use of Solution
I have been using this solution for a decade.
No issues with deployment.
No issues with stability but it completely depends on how you/ at what stage you implement. Additionally, what features you enable.
No. You need to look upon sizing, one should never oversize nor undersize. Detail understanding is a requirement one needs to keep in mind.
Customer Service and Technical Support
Customer Service: Good customer service.Technical Support: Good technical support.
The initial setup was normal.
Vendor, but internal team should be aware of the technology.
Recently we have upgraded to new model, now looking into 3yrs cost, this is the first year. So cant say much.
Other Solutions Considered
Yes, we evaluated Cisco.
Only advice I can give is that whatever product you select, it's important to keep in mind your Requirements, Budget, and POC.