Well, Obviously, I'm using it.
Equilibrium is bad. It actually stops producing weather if it reaches equilibrium, there will be nothing to change, and you'll always get the same message. Simply because all of the changes revolve around the cells around the one being calculated. Now, there are enough safeguards to ensure it should never reach equilibrium.
The code will automatically set up all the cells when you expand the map. The only ones you HAVE to set up are the ones you're assigning areas to. But if you want to utilize the system to it's full extent you'll want to set the climate and hemisphere data on all the cells to fit your world, the code just assigns one at random so you could end up with some odd occurrences. However, That might be what you're after anyway.
My thoughts? Well, I'm incredibly biased.