What about expenses? That is I do have a fund like this available in my 401k. Right now, all of our bond exposure is in DH's IRA at vanguard (total bond, short-term investment grade, high-yield corporate fund and Wellesley). We also have a little bit (less than 10% of portfolio) in the prime money market fund.
My 401k is at Fidelity and I currently have everything in the Dreyfus S&P 500 index found which has an expense ratio of .51%.
I do have available the Fidelity Advisor Stable Value Portfolio Class II fund. The expense ratio is .94%. One year performance of the fund is 1.13%.