I have to say, for all the Mars Hydro bashing, I've just flowered a 4x4 tent on them and I'm impressed.
I normally grow NFT, 5 plants to a 4x4ft tent, 400w MH veg, 600w HPS flower.
Depending on the strain, I get between 11 and 14 ounces. That's proper dry - self use dry - not "nearly dry" to...