Personally, I wouldn't rely on anecdotes for such a decision. But there are quite a few threads here discussing success.
The American Optometric Association's Clinical Practice Guideline has researched based intervention on best practices. They clearly support therapy for specific conditions targetting specific outcomes:
http://www.aoa.org/documents/CPG-18.pdf (around pg. 36)
But I would think therapy not tied to a specific visual issue seeking a specific outcome would be suspect. A developmental optometrist or ophthalmologist would seem a better place to start.
