Totally agree. Most of the time, a room build will be cheaper than a gorilla. Of course, the nice thing about tents is that they can be taken down and hidden away if absolutely necessary (or if moving).
Another great point for Packs to consider. The gorillas do have a clear height advantage. They have expansion kits to make them even taller. Unless I've missed them somewhere, no other tent competes on height...which could definitely come in handy for sativas, especially if you have them elevated off the floor at all.
That said, I've grown some stretchy sativa leaning hybrids in my hydrobay without too much trouble. Of course, this required a bit more training.