It is unusual so has a certain surprise value, I suggested it as an opening move the other night to a junior whom prefered playing with the Black pieces. The idea being that you give Black the initiative, but you have played a move that may have merit in certain lines.
It is quite often a useful move actually, whether to prevent the opponent's bishop or knight from coming to b4, or to provide a retreat field for your king's bishop. Maybe even to play b4 but probably u don't want to do that on move 2.
If I was Andersson playing on web chess sites I would probably play it.
Otherwise I would not!!