The main point in my view is that you
a) many guests normally much coal fills, so you can grill long. Then the grill in my opinion, is too close to the coals and barbecue food can burn. This module of the grate sits higher and the meat and sausages are perfect. In addition, you can the warming rack mount or a shish kebab.
For Thüros fans thoroughly recommended.
General tip: I suppose in principle the "summer hit" than coal and mix with wood briquettes. Burns much longer and better glow!