I use an older vintage FireBoard regularly. I think it could be more intuitive to use but it helps me track my pit and meat temperatures. I adjust the controller settings used based on its readings.
The FireBoard can also easily replace the controller on the Masterbuilt Gravity Series Charcoal Grill/Smokers.
EDIT: Replaced Autocorrected word.
Also, real-time monitoring is easier from my iPad or iPhone rather than from my Apple computers.