The Hollis unit is aimed at the recreational diver, I could see a use for it on livaboards where your in that nitrox use but most suck a 12lt dry long before there NDL is up. You can flog a two day coures and refresher courses etc. less bubbles so closer to fish. Its designed to be able to be taken on as hand luggage, you just pay for the scrubber. The cost is a big thing but a bulk deal where you hire them is possible. Perhaps 5 years away but not improbable.