I have hundreds of things I do and very few go to product or build phase.
Not my view for this one as it is a personal issue. I would not be comfortable claiming it could do anything for others like it does for me. Also I'm not basing it on anything scientific other than raw experimental data from 1.
I'm happy to share it here and FREE for everyone.
I run a tiny tiny tech incubator in the UK, so hands full : )