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I'd like to say that after trying DirectAdmin, it is now my control panel of choice. This control panel has the flexibility of CPanel (allows multiple ftp accounts, daily backups of everything including emails!, etc) but also includes the nice design and easy to navigate feature of Plesk.
Now the big one! Lifetime License: $299.00 (one-time, no recurring charges)
this sure beats CPanels $1250 license fee and Plesk's $799.
Rigth now I'm using CPanel, however I'm planning to move to DirectAdmin, and from what I heard it can easily take CPanel backup tarballs to import your clients into a DA system.
One more thing, from my brief experience I've also noted that DA loads faster than CPanel