Both Vanguard's and Fidelity's target date funds have slightly higher expense ratios than their regular index funds, but they're still pretty low (0.14 for Fidelity, 0.15 for Vanguard). Those companies' S&P index funds are more like 0.05 or so, but if you want a "set it and forget it," their target date funds aren't too bad. And at least as of today, Fidelity's 2050 fund and Vanguard's 2055 fund only have 10% bonds, so it's not like they aren't growth-oriented this far out. Our non-401k stuff is mostly in Fidelity or Vanguard target date funds.
Now the target date fund in my 401k, lol. Expense ratio north of 1.00 last I checked.