not sure about the specs on the one you posted, but this is what i have and i love it. i use the smoker almost as much as the grill:
Weber Summit® E-450™ NG Gas Grill
Model 1841001
$1,529.00
Beauty, elegance and the capacity to grill for the entire block. With thoughtful touches like polished trim, smooth lines and an enclosed tank storage area, this Summit® gas grill will give your neighbors something to talk about. Includes a 10-foot flexible hose.
* 48,800 BTU-per-hour input; 4 stainless steel burners; 650 sq. in. total cooking area; 112 sq. in. warming rack area
* 12,000 BUT-per-hour input flush-mounted side burner; 8,000 BTU-per-hour smoker burner and stainless steel smoker box; 10,600 BTU-per-hour infrared rear-mounted rotisserie burner and spit fork rotisserie attachment with heavy-duty motor
* Snap-Jet™ individual burner ignition system; 9.5mm diameter stainless steel rod cooking grates; stainless steel Flavorizer® bars
* One Grill Out® handle light; 6 tool hooks; Weber® cookbook
* Assembled Depth (In Inches) : 30.0 In.
* Assembled Height (In Inches) : 57.1 In.
* Assembled Weight (In LBS) : 252
* Assembled Width (In Inches) : 66.0 In.
* Cooking Surface : 650Sq. In.
* Energy Star Compliant : False
* Grill Height : 57.1 In.
* Grill Width : 66.0 In.
* Grill/Smoker Fuel Type : Natural Gas
* Heat Thermometer : Yes
* Primary Cooking Area : 538 Sq. In.
* Rotisserie : Yes
* Side Burner : Yes
* Warming Rack : Yes
* Warming Rack Area : 112 Sq. In.
hope that helps!