Pure Storm Limited GT is best suited for the advanced players, who like to produce their own power and at the same time have maximum control. This is a demanding strategy that 4.5 NTRP players and above can benefit from, but beginners and intermediate players should find something more forgiving starting out. This 11.9 oz. racquet at 95 square inches requires solid strokes at high racquet speeds. The stiffness is only 61, which adds lots of control and allows players to take a big cut at the ball and still maintain control and have it land just inside the baseline.
The closed string pattern also gives you a formidable control of the shots, but the spin capabilities are somewhat limited with this type of string pattern in a 95 square inch racquet. On the plus side your strings will last a lot longer than an identical string used in the same racquet if it was an open string pattern. You do have to work harder to get any spin, but that is not to say it is impossible. Ryan Harrison is using the Pure Storm Limited GT, and several other ATP players are also using a closed string pattern, although the open string patterns is more dominant.
The GT technology consist of tungsten added to important areas of the graphite frame for superior control and feel. Woofer grommet technology increases the sweetspot and makes off-center shots more forgiving. You also gain up to 10% more power due to a minor trampoline effect from the grommet.