First let me say the DigiQ DX immediately revealed some flaws in how I have always cooked in the past on my large Egg.
In the past I always smoked my butts at 225 on the dome thermometer. I now realize now that I was only cooking at around 190 for much of my cook. This explains why it always took me around 18 hours for a small 7 lb butt.
After much reading up on how to use the DigiQ with the Egg, I opted to clip the pit probe to my v-rack, so measuring grill temp. I set the DFMT to a small 1/8" opening, and the DigiQ damper to 1/3 open. It kept the pit temp at a perfect 225 all night long. And I mean "perfect" 225. I was amazed. The dome temp read 255 until about the 6 hour mark when it settled down to close to 225 as well.
The only problem I had was I ran out of wood at the 12 hour mark (during the plateau). Doh! That had NEVER happened to me before. I read about people having fire issues, and how they had to be very careful about how they built their fire. I always assumed I was lucky, but now I know it was because I was always cooking WAY to cool, and now with the DigiQ stoking the fire all the time, I have to be extra careful about building a good fire.
Anyway. Highly impressed and excited about the DigiQ. Its even making me brave enough to try a brisket now.