In my experience, the best features Plesk offers are domain and user separations with strict quota and a great level of configurations for each client. The valuable aspect is that Plesk provides everything in one panel. It includes backups and whatever you would want to have; you are able to configure it. It includes mailing systems, mass mailing systems, websites, SSL termination, different redirects, even different databases and language engines. Plesk is great and easy to use. Plesk has positively impacted my organization by speeding up the release process dramatically and giving clients a level of confidence and independence from the engineering team. This has freed up a lot of time for the engineering team. Plesk maintains a lot of system operations such as system updates, language updates, and keeping different frameworks up to date, which has dramatically improved the business flow and system administration flow.
