Proxmox VE has been used to set up, deploy, and manage our QA, development, and production environments to offer high availability, snapshot backup capability, and scalability to allow migration from server to server. Proxmox VE's versatile use of storage options makes it ideal for just about any environment, with the ability to mix and match as needed. For example, using iSCSI for one instance while using Ceph for another. Development can utilize the iSCSI, for some level of speed but reduced redundancy, while Ceph could be used for production for high redundancy and high speed utilization.
I've consulted for various companies and helped them set up and deploy custom Proxmox VE environments for a number of industries. From travel/entertainment, to housing/realtors, and even retail. To this day, they still continue to use Proxmox VE, and love it's power and versatility just like I still do. I continue to use the Proxmox VE server for my home cluster running numerous services, utilizing NFS, GlusterFS, Ceph, and local storage options it provides, with live migration from system to system.