They warn about the fireballs in the manual, and pretty much on every bge page. Since the oxygen inside is used up the flames make their way upwards to oxygen rich areas, i.e eye-brows and arm hair. 675 is high for a first grill! How about breaking in gently with a 18 hours brisket?
Weber 22.5 OT-silver with cast iron grate
Kamado for low and slow, and baking.
Smokey joe for trips.