I actually just left Betterment because over the last few years their Core portfolio has really lagged performance of my non-Betterment investments (largely VTI, VTSAX, VBTLX in approximately 80/20 stock/bond split). Upon ACATS-ing over to another broker, I found they'd purchased some funds with high fees when there were really similar funds available with far, far lower fees. The only reason I can think of to buy a higher expense fund when a much lower expense variant exists is in the name of tax loss harvesting, but even that is a really short-sighted decision.