Yielded 280g total in my last grow with what turned out to be an amalgam of different strains (mostly hash plant). In my opinion 3-4 plants per square foot (PPSF) should be your max with any lights unless you are growing some tiny little plants. I'm thinking my 25 in 9 square feet (almost 3 PPSF) is still too tight as surrounding sun leaves really crowd light getting to the undergrowth.
I was going to go for the 4" Aquamist systems, I currently have an Aeroflo which I like more, but a large root mass makes it impossible to check on them, where as the former's lid can just be lifted... It's 32 plants in eight square feet, so 4... Oh, I thought it was more... :X
Also, general acceptance doesn't mean something is good, Grey Goose is awful, the guy even wrote a book about how there were no expensive vodkas, so if he made any vodka and put a high price on it people would buy it... And they do. Even if something has evidence to back it up, bleeding edge tech costs money that not everyone has, because proof or not, new tech isn't an investment people are going to jump at, so there are less producers, who then can charge more...
Pretty sure that's in Business 101, supply and demand, skimming vs penetration pricing...