It's important to review stuff like this for the newbies to diving (i.e. me - this year's only my sixth season). It is nice to see how kit has evolved and is now much more standardised, and how the tech is more readily available. I guess in the context of the 60's, 70's, 80's & 90's, the Auto-Air may have had a place. Definitely not with contemporary kit configurations and protocols though.