If you're thinking about buying a Cobra driver, see this:
Here's a cool offer to get your long game headed in the right direction. From now through June 30, players who purchase a new Cobra driver -- the King LTD, King F6+, or King F6 -- will receive an Arccos Driver unit at no extra charge (normally an $80 value) to track just how well they pound it off the tee.
The unit attaches to the top of the driver's grip and syncs to an iPhone or Android device using the Arccos Driver app (free to download).
You'll receive immediate statistical feedback such as the range between your longest and shortest knocks, shot dispersion, your longest drive, and a "smart average" that throws out anomalies. A gaming component also provides personalized challenges such as hitting a prescribed number of fairways, and allows you to compete in contests against friends as well as other Arccos users.
In addition, the app supplies yardages to the front, center, and back of each green, and calculates yardages to hazards. Here are links to our ClubTest reviews for the King LTD, King F6+, and King F6 drivers.