<prompt> Human: If I look at the value prop for Betterment or Wealthfront, it seems that I can achieve all of the benefits of their service through Vanguard using Admiral Total Market funds, except for tax harvesting. Betterment and Wealthfront claim that tax loss harvesting gives an extra .77 vs 1 respectively which would more than offset their .15 and .25 respective fees. If this is true, then these services pay for themselves and I might as well take advantage of the better user experiences IMO. Does anyone have any experience with their tax loss harvesting and if these claims are true?  <response>: If you read the fine print on the study behind those numbers, youll find it took place from 2000 to 2013, which was a really great period of time for tax loss harvesting, because there were two major market downturns. In fact over that 13 year period the SP 500 was only up about 60, dividends included. Thats a CAGR of 3.55. A bad time period.I would venture a guess that given a longer timescale the returns from harvesting in those downturns would not be as great. 