Thanks for your responses. It never occurred to me anyone would oppose the idea of an automatic BC. To me, maintaining neutral buoyancy is a chore, which distracts from the purpose of the dive. I think it's analogous to a manual vs. automatic transmission. Sure, race car drivers still use manual transmissions, but the vast majority of everyday drivers use automatic transmissions.
The device is simple. There are no electrical components; it is purely mechanical. Once it is adjusted at the surface for the individual diver, it uses water pressure to expand or contract a volume to keep the diver neutrally buoyant at all times during the dive. Since we are in the design stage, I don't know how precise it will be. It should be exact. We will have a prototype that we will test by this summer. I'll keep this forum informed as we progress.