This thread is pretty old now and some users have changed their mind and now use another desktop.

This is the reason why i'm closing this thread and give you the link to a new one on the exact same topic so we can have a more up to date answer to this question.

New thread here :
http://ubuntuforums.org/showthread.php?t=564439

Feel free to PM me if you wish to reopen this thread and have valid arguments.

Thread closed