Fired up my new XL for the first time last night - my first brisket is coming real close to being done, and it looks fantastic.
But I've noticed that the dome thermometer is, well, useless. I also have a CyberQ Wifi. It's been holding the grill temp at 230 for the last 15 hours or so. The dome thermometer? Has shown temperatures between 260 and 300 degrees. It's not even close. I made a point to calibrate it before first use (because the "special" people who assembled my egg originally calibrated it to 0 degrees) on both the high end and the low end. I can only conclude that the temperature at the top of the dome is significantly different than the temperature at the grid level.
So what's the use for it if you can't use it to benchmark temperatures at grid level?