What makes a great regulator?  The difference between a "good" regulator and a "great" regulator can make or break the enjoyment of any dive experience.  Comfort, reliability, and high performance are the most important attributes that a regulator should exhibit.  Every great regulator should make breathing effortless.  Air should be delivered easily and consistently, on demand, and in the quantities required.  And through technology and design, your regulator must be completely reliable.