If you contribute $16,000 this year to the Target Retirement fund, that's $27.50/year in fund expenses. It's within reason for a target date fund. I'm a little surprised at the extremely low 0.01% expense ratio ($1.60/year per $16,000) outside of a massive government managed fund. Blackrock manages "iShares" funds, which have good expense ratios and plenty of index funds, so they seem trustworthy to me.