This formation is best used for long balls that are passed upfield. Since this position includes 7 offensive positions, it is definitely a formation to consider for a stronger offense. The seven forwards can be split among winders, inside forwards and one striker. Hopefully the large amount of forwards in this formation can overpower the other team's defenders.
Some disadvantages include a smaller defensive line. If the offense were to lose possession of the ball near the other team's goal, there are only three defenders that would pose a threat to the team.