O7 Worth Mayhem Bat - Opinions?

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Considering this bat for my gal.
It's the orange Worth Mayhem, the first Worth all composite bat. I think it is from 06 or 07. Does anyone have an opinion of this bat?
Appreciate your feed back.

 

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My daughter has one that seemed to lose its pop before the season was over. I have read similar opinions on other fastpitch sites.