Yup---What Eman said.
My Maverick probes I think respond to temp changes quicker than the MES "in wall" smoker sensor does, because the changing air runs by it more, but later when the whole thing settles out, they get real close to each other.
The built in meat probe seems to be right on when in meat, but just laying around it could be doing strange things, especially if the tip is against metal.
Bear