Yeah, Plesk is nice.
Ages back we used to offer Plesk v2.5, yet then we changed to Plesk v5.0.3 and then to cPanel.

Although, I'd never have my clients go back to Plesk unless v6.0 came out - I'm sure I'll only offer Plesk when v6.0 comes out, as that should have all the features my clients need which is nice.

The thing that my clients need and want is Cron Jobs, yet I don't want to give out SSH, although may do in the future, and the other half don't know how to even use SSH!
So until they make sub-domains like cPanel has it and fix the Cron Jobs thing, I'll never use Plesk.