I found that the software was easy to pick up without prior experience or training. It is our software of choice for backing up file servers and RDM drives, and it has performed well in that capacity.
All information is easily available at a glance, and although the reporting could be improved, the GUI is easy to navigate. Dell has been improving and updating the software frequently. Updates are usually easy to perform, although the agent software will require a reboot to complete install/upgrade. Support has been helpful, although I have not needed them often once I learned the software's ins and outs.
When the backup chain is interrupted, a new base image must be created, which can sometimes cause issues due to storage needed and time taken to complete. This generally only happens when the protected server is rebooted improperly.
The software currently depends on VSS for its snapshots, which can occasionally mean backup failure due to failed VSS writers or VSS timeouts. Proper setup and management of the software will greatly decrease these issues. I've found that staggering backups of volumes on large servers helps tremendously.
I use this on file servers to allow customers the ability to restore data at the block level with a long retention period. We also use it to back up RDM drives, as this is not supported by Veeam. Restoration of files is simple.