I did it before and yielded 7-12 grams per plant.I had 18 plants going under a 600w hps and like 15 cfl's of various watts in a closet.
Try and grow a nice indica strain to.Also look into topping,fimming,etc.
Id say it's worth it if you have an area with lots of space but has height restrictions.
If your only trying to do a couple plants I think it's a waste of time.
Theres lots of threads on here about it,you might be interested in SOG growing to.