What greenisgold says is true, the little reservoir you create on the bottom will dry up in about 3 days or so. Smaller containers will need to be watered more frequently.
After a couple of botched soil grows I decided to try the hempy method, and my plants have been doing really well this time around. I'm about a week away from my next harvest and I'm looking forward to doing another, but I think I'll change a few things that may have affected the grow early on. First, I didn't start off in smaller containers as suggested by the other hempy growers. I started them off in those peat moss pucks and then just threw them into their pots when I thought they could stand up on their own. Hempy grows seem to be painfully slow until the roots hit the reservoir on the bottom of whatever container you're using, and my plants seemed to take their sweet time since their pots were so big to start.
Next, I'll try to follow the Lucas formula more faithfully. I've read on another forum somewhere that you could use Floranova bloom the entire grow by just feeding in different amounts- 5mL in veg. and 8mL in bloom per gallon. In my case, I've barely needed to fool with the pH at all using this particular nute. The thing is, it was supposedly written with RO water in mind. I've just been using pH neutral tap water, though I wonder if it really makes much of a difference.