I have looked at that system also. My conclusion was that the controller was expensive and one day i will try to do it my self. Mor gratification for me like this and if it breaks then i would be able to fix it.
Now, however I brew inside, using propane, I know the dangers of it, but what I do is this. I heat up the strike water in the stove and add the grain. Then I take the pot off teh stove and place it on the banjo cooker. After sparging, I only use my propane to take it up to boiling temptures. After boiling temptures have been reached (I hate waiting for the boil), I put the kettle back on the stove and continure to boil that way. I have seen people do the whole thing on there stove by using eletric or natural gas.
I still do partial mashes untill I get my eBAIB system going.
Beauty lies in the hands of the beer holder
Kegged: Centennial Blond
Bottled: Mambo in your mouth, Cranberry mead, Peach Ginger mead, HopSlam, Citra DIPA
Primary: Vanilla Bean Dark Lord.
Secondary: Firestone Walker Wooky Jack