Of course after reading this in Scuba Diving I don't think I would trust their life support equipment.
IST R600 Saturn & R700 Imperial
IST R600 Saturn
IST R600 Saturn ($290)
First-stage type: Balanced piston.
Low-pressure ports: 4.
High-pressure ports: 2.
First-stage swivel? Yes.
Second-stage adjustments: Dial.
THUMBS DOWN:
Failed all breathing simulator tests.
Poor wet breathing.
Significant changes in breathing and wetness in differing positions.
IST R700 Imperial ($250)
First-stage type: Balanced piston.
Low-pressure ports: 4.
High-pressure ports: 2.
First-stage swivel? Yes.
Second-stage adjustments: None.
THUMBS DOWN:
Failed all breathing simulator tests.
Poor breathing, regardless of position.
Bubble interference.
Consumer Alert
These two IST regulators should not be used for scuba diving. Not only did they both fail every breathing simulator test, neither of them even made it to 66 feet on the objective machine tests. They performed worse than the private-label mail-order regulators we evaluated several years ago.
During the ocean ergonomic tests, the less expensive R700 did better than the adjustable R600. No owner's manuals are provided by IST. The poorly translated IST catalog tells us "Balance piston ... adjustable second stage will provide smooth effortless breathing." "Made with superb precision engineering ... designed to breathe effortlessly ... extremely safe ..."
These two regulators not only failed to meet U.S. Navy and European CE criteria, they could not function at 66 feet and were overbreathed by test divers in 30 to 40 feet of water.