What I don't see here is what I'm most interested in: how effective are robo-advisors? What percentage of the time do they beat the market, if ever? Am I better off simply investing in S&P 500 or a Vanguard target fund? Or does FutureAdvisor or Betterment or Wealthfront provide some unseen benefit?
FWIW, I've seen stats that suggest that 85% of advisors (robo or otherwise) perform below the S&P 500, which frankly is not a great sign for that industry.