At the time of filming this review, the Breather Voice had not been released. Now, instead of choosing between The Breather or Breather Fit, I would recommend the version specifcally designed for singers- the Breather Voice, which retails at $60:
Every Breather device is a respiratory muscle trainer; it provides resistance to both the inhalation and exhalation muscles. You can control the degree of the resistance. The Breather is best used by people who are recovering from injury or illness, the Breather Fit by advanced athletes, and the Breather Voice by teens and adults looking to improve their breath control.
I personally own all three and would recommend The Breather to beginners, the Breather Voice to intermediate singers, and the Breather Fit to advanced performers.
Check it out and enjoy!