You get into plant count problems there. The more plants you are caught with, the more they like to write in the paper that they got some big ass criminal with 500 plants and the public gets all frenzied and imagines a FIELD of 3-footers, lol... when there's little ol' you sitting at your house with a bunch of 6 inch clones. And if you're a med user limited to a half dozen plants, you get fooked.

Plus, yield is determined by light, not plant count- You're never gonna pull 18 pounds off an omega or coliseum- you'd need over 10k light in there plus CO2.

Not to say these things aren't cool as shit. Personally though I'm happy with my primitive floor setup- it was CHEAP.