The Vision Woo is a two ring Stainless frame. The top ring holds a grid near the felt line. The smaller diameter ring drops inside the firebowl and creates a platform to hold stones, grids, woks and such
By grilling on the top ring, temperature control is less demanding. The lump burns over 1000°F in the core, so going vertical makes it easier to grill in the 325°F to 425°F temperature range. By going up, you can take full advantage of the radiant heat and minimize your chances to burn the food. Plus, handling food with tongs and turners is much easier. Typical cooks are create a light crust, cook to an internal temperature, render fat and/or crisp skins. We do all chicken, fish, veggies and sausage (brat) cooks on a raised grid.
The lower ring gets closer to the fire to sear hot and fast or set-up with a ceramic stone under the cooking grid. When searing, if we get closer to the fire, then we don't have to have as big a fire when compared to using a grid higher up.
The lower ring can hold full or half stones, so two half stones provide more options than one full stone. Use two stones for the indirect, deflector, on BBQ cooks. Use one half stone to create a dual temperature zone when grilling foods that require more attention or differing methods.
And, when you get bored, try wokking. It's fun, different and maybe healthier. The bottom ring holds our 16" Carbons Steel Wok.