Former founder of Frame (Techstars, acquired by Sailthru), NewsCorp VP of Product, Microsoft PM,Advisor at Columbia
Having a clear value proposition, that is effectively tested in the market is the most important thing to work towards when building a product/business. Once you have that everything else follows. I've helped several quickly growing startups work on refining their value propositions and identifying the most effective ways to test those value propositions in the market.