A new rebreather is now on the market, the Poseidon Discovery which is also called the Cis-Lunar Mk VII. This new automatic rebreather was designed by Bill Stone with Swedish-based Poseidon Diving Systems.
From the product decription:

The diving is simple. Open the tank valves, wet the switch on the back of the display, wait for the systems check and off you go. Forget about everything you ever heard about PO2, scrubber life and oxygen cells. Our system will handle all that. Just remember to breathe.

You don’t adjust anything, and the mouthpiece vibrates and blinks to alert you of a malfunction. There is an integrated bailout valve in mouth piece that allows you to breath open circuit and return to the surface. There is also an integrated gauge/computer to track your decompression obligation and how much time you have left. You can read the manual here.