It is best suited for larger companies with lots of remote workers that need complex access management. We've barely scratched the surface on what Appgate can do via its API.
With proper design, VMware NSX can and should be deployed to virtually any VMware virtualization environment, but the deployment should be tailored to the needs of that environment. There isn't really a one size fits all deployment design for all environments. That versatility is what provides its greatest strength to a business.
Live logging in the client. Currently you have to "download" the logs into a zip file and then open that zipfile to look at the logs. There's no logfile to tail or watch.
Load balancing between controllers could be better. Currently relies on round robin DNS and sometimes a browser will pick a different IP than previous and you'll get a big "LOST CONNECTION TO CONTROLLER" message.
The company has been supportive overall of our needs and desired features. I have not personally called the support services, but I've heard no direct complaints either.
The existing system was FortiGate. The management of the system was a hassle. Because IT personnel had to manually create VPN accounts, user passwords were known to who created them and the end user did not have a way to change them. This created a security issue in the event an IT engineer left the company.
We use both Cisco ACI and VMware NSX, and while they have different strengths and capabilities, I would recommend VMware NSX, as it can be used in all VMware environments, without costly physical infrastructure changes. Cisco ACI provides some of the same capabilities, but not all. It's focus relies on physical networking changes.