Yea, you got some good info from everyone.
I just went from indoor hydro to soil and I gotta tell you its not how fast you can veg, its what you end up with in the end. I've had about a dozen hydro grows before going to soil. I found you can increase the rate of which the plant grows in veg by frequency of watering and feeding. Drown them, let them dry real good then feed them. Riddleme's got some good threads on here with documentation. In my backyard greenhouse I grew monsters last year with FF mix in smart pots. Largest plant yielded 2.7 pounds. Yea, soil works man.