I have a small sum at Betterment at the moment .. sitting at about 5% return YTD - opened it in early to mid January - will probably see about 8% to 10% at year end IF the market performs well
Their portfolio is largely vanguard ETFs and bond index funds. I have about 10 different ETFs and indexes in the port
They have a "tax harvesting" feature that is supposed to minimize your tax exposure by harvesting losses. Their fees haven't affected my growth plus they automatically reinvest dividend payments.