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Heatermeter... if you're confortable soldering a PCB and like projects. Hands down the best feature set and support with the exception of the lack of ability to control multiple pits. It's the only one I'm aware of that can use a draft based mechanism to take advantage of the BGE's natural convection.
Make sure you know whether your butcher sold you a full packer or the flat only and adjust based on that. That said I'm no expert but foil isn't getting anywhere near a brisket of mine until it's ready to rest in the cooler.