It is used across the whole organization. We use it as our core VM platform. It is a major component of our Disaster Recovery policy as well with live snapshot replication. The capability to live migrate between nodes and to instantly spin up snapshots made this an easy decision for my organization
Snapshotting - Scale is great at scheduled snapshots to add a layer of redundancy to any DR plan. it can also send snapshots to a remote scale system to act as a VM platform and a DR platform all at once
Cloning - If there is an issue with a machine, it is extremely easy to clone it and work on it outside of production
Ease of use - overall getting it set up required 2 or 3 command line commands and the nodes did all the work themselves. Uploading ISOs is easier in Scale than any other hypervisor I've ever used
Replication - We utilize a second set of nodes in our DR site that all core servers replicate to hourly. We have never had an issue with failed replications over a VPN
The best overall thing I can say about Scale is the increased DR support. If something fails with the scheduled snapshots we have a 10-minute recovery window so we never lose more than 10 minutes of data.