I am a member of a couple different growing forums and for some reason I hear about being rootbound way more often here at RIU than anywhere else. I think it has just been spread around here that it is terrible and spells death for all plants. I've grown 6 foot tall plants in 2 gallon pots, 4 foot tall plants in 1 gallons, all without ever running into problems. I just don't believe that being "rootbound" can cause some of the problems I've seen attributed to it. Sure you can transplant into these massive pots for your first couple grows but I guarantee after a while you will learn that it's not necessary unless you are growing actual trees LOL.