It's been about two weeks, and our son seems to be opening and using his hands more than before we started the choline supplement. One of his therapists comment recently that he's using his hands and keeping them open more than before. It's hard to conclusively say that it's only the choline supplement, but his hand improvements seem to correlate with the introduction of PhosChol.
Doctors at the University of Colorado are seeing if choline taken during pregnancy by mothers can prevent mental illness in children. You can read more about their work at Choline Baby.