Anyone buying a bond fund right now needs to understand the dynamics of interest rates. You will see erosion in the value of your investment if rates rise. Interest payments may remain equal or increase, but your initial investment will likely decrease, at least in the near term.
If you buy a bond, you have par, the value a bond will return to, short of default, which is usually $1000, while still getting the same interest payout.
Right now for the most part bonds suck, but if you feel the need to buy, I would buy individual issues because you are highly likely to get at least par, plus interest. With a fund? Not so much.