I've had the BGE for six months now and mostly do low temp pork (200 - 300F dome), medium temp chicken (250F - 400F dome), and medium temp pizza (~ 400F dome). A couple of times I've done burgers at 500F dome. A couple of times have cleaned the BGE at 550F - 600F dome.
The most I've ever run my BGE up to is about 700F dome. It was only for five-ten minutes each time. Just to see what it was like. (ok, so a couple times those were 'sleeping at the wheel').
How hot have you gotten your Egg up to, for how long, and what for?