This griddle is amazing, well seasoned even when new, plenty rugged without being too heavy, and heats quickly. I previously owned a large griddle that sat on top of the grates and this is far superior. It fits well so it doesn't move at all when cooking, it sits lower and closer to the burners so it heats more quickly and evenly. I have been using this griddle to cook everything this summer!!
I like the griddle. I am disappointed in the item description "seasoned ready to use". The initial instructions recommend 2 more seasonings prior to cooking on it. Not what I expect from Weber. I own the 300, a Kettle Premium, and a Go Anywhere Premium.
The full-size griddle is a wonderful upgrade. In fact, we installed it right away, and have cooked everything on it. Steaks are wonderfully & evenly charred. Breakfast is incredible, and very fast when you can cook 10 pancakes at a time.
We even stacked the standard grill grate over top the griddle, and baked pizza in the weber. It worked great!
The only caution - It gets VERY hot! I'd recommended only preheating the grill using only about 50% of the gas flow. (We have the natural gas model) Using 50% gas flow, the grill heats to about 450°F. Much hotter, and even Avocado oil will flame up!
10/10 recommended the full size griddle top. It's extremely versatile, and makes cooking fast, easy, and delicious.
I really enjoy this griddle and use it all the time. Fit into my Spirit 315 series perfectly gets real hot and now I can cook things like pancakes, bacon, diced onions and all kids of things that would fall through the grills. Large and heavy duty carbon steel that cleans easy. Glad I purchased the perfect fit Weber product instead of aftermarket which would be set on top of grill plates.