First of all, Fidelity has been in business for a long time, and it has helped many people reach their retirement goals. It certainly is a very experienced company, and will work for you and your mutual fund investing. However, how do you know if Fidelity is the personal finance company for you?
Simply look at the track record. Quite simply, Fidelity offers a wide range of mutual funds, ranging from relatively conservative to more aggressive. Depending on what kind of investor you are, you can make your investment decisions accordingly. Obviously, more aggressive regional funds will tend to have bigger ups and downs in a more conservative one, but also will possess much larger growth potential especially in the long run.

source from: http://my-fidelity-401k.blogspot.com