Is there any use for Myers-Briggs model for S.Development?

[LucyKid]

On the last video about spiral dynamics Leo mentions the Myers-Briggs model and another one which I couldn't really understand what he said.
Do these models offer any new knowledge and perhaps insights about the self? A way towards personal development? Or are they rather useless models? I am curious, and I am wondering whether I should learn about them or not. 

[Bluebird]

All models have usefulness. MBTI stems from Carl Jung's cognitive functions which are very useful to understand.

Keep in mind it is still a model and you will tend to fit everything into it. If you want the most effective way to understand yourself, do it directly. Peter Ralston 'Pursuing Consciousness' is useful for this.