The 5.3 is a terrific carbon fiber racquet suitable for a wide range of players. The 5.3 is one of the world's best selling racquets ever. It offers excellent stability and control with modest power in a light-weight, comfortable playing frame. The 5.3 OS suits 3.0-4.0 players with a modest up to a full swing. This is a "Wilson Hammer" type racquet which means it is balanced to be a bit head heavy; although the extra head weight is not particularly noticeable in the 5.3. Players with a very deep swing may find it a bit too powerful. It is maneuverable, the hammer head weighting is nice for following through the ball, and it is generally comfortable to use.