<prompt> Human: Ive been at my company for 11 years and for all that time probably longer the 401k has been with Vanguard. Starting in Jan it will be moved over to Fidelity. Ive considered my self a Bogelhead and have really felt secure with Vanguards low fees approach. Im not too excited about them making this change but will have to go along. So what am I looking at here. Pluses and minuses?  <response>: Fidelity is a great company with low cost choices - mostly equivalent to Vanguard.A lot of it depends on how your company negotiates the deal with Fidelity - i.e. who pays what cost, but given the typically low cost of Fidelity plus your companys history of a good plan, I dont think Id be pessimistic. 