Fees are one of the main items you control in investing. Why pay Betterment when you can go to brokers like TD or Schwab and buy exactly the same funds commission free? You can then spend an hour each quarter rebalancing.

If you don't want to even rebalance, then go buy one of the target date funds from the likes of Vanguard.

TLH is extremely oversold. I don't need to repeat what is easily found in a google search though.