Entrepreneur Book Club discussion

Has anyone ever implemented the "Six Thinking Hats" from Edward de Bono?

Theory is one thing but what was reality like?

The six thinking hats are:

White Hat: Neutral and Objective – facts and figures
Red Hat: Emotional, often anger
Black Hat: Sombre and Serious. Point out weakness, negative
Yellow Hat: Sunny and Positive. Optimistic and hopeful
Green Hat: Creativity
Blue Hat: Control and organisation of all the hats

My own experience and feedback I've received is that as a group exercise it is not always successful and obviously depends on the commitment of each member of the group.

Has anybody any experiences they'd like to share?