I've tried it once for a cookout with 10 people.  The fire was hot (around 400 degrees) after about 20 minutes.  Then it began to fade, even though the dampers and air flow was set for high heat.  I had to move much of the meat from this new unit to my 20 year old basic Weber Kettle Grille.  Luckily, the old Weber was able to finish cooking the chicken breasts.  I apprehensive about using this new grille, especially for a large crowd, until I can figure out why the grille did not work properly.  I have owned Charcoal Weber Kettle Grilles for decades and I've never had this problem with the older units.