Simplicity! Square at the top and a much shorter swing. The Wristfirm "firms" up the left wrist at the top. It will not allow you to cup or bow the wrist thus enabling you to make a simpler and much more efficient swing, time after time. Since the swing is now shorter, you will be able to accelerate at the proper time instead of before the ball. 
Notice in this picture how the hands are ahead of the ball. See how the shaft angle is angled forward. This turns a 5 Iron into a 4 Iron. And since the hinge of the left wrist has been eliminated, the bigger muscles of the back & chest are forced into the swing resulting in more efficient swings with less effort. Swing easier & hit it further. Game of opposites
  Fundamentals | Benefits | Shortgame | Comparisons  
   
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  The Wrist Firm integrates in your mind what the impact position is supposed to feel like and thus teaching you this 'Feel" that you can more easily duplicate on the course. You will see an added benefit from the Wrist Firm. Instead of flipping the wrists through the impact position, the Wrist Firm forces you to rotate through the ball with a more pronounced body turn. The body turn encourages longer shots due to using the bigger muscles and straighter shots due to removing the added angle of a cupped wrist.

And finally for the punch shot, the flat left wrist and low clubhead follow through are the fundamentals for this shot. If you cannot keep that left Wrist Firm, you cannot hit this shot. The Wrist Firm will demonstrate what the hands are supposed to do at impact.

For the better player, the Wrist Firm will further ingrain the feel of acceleration through the ball especially around the greens. Let's examine the Wristfirm and it's shortgame benefits.