I used to own a Weber box model that encloses. They are nice.
But the problem is, like all propane grills, the juices attack either the metal tent over the burner or the burner, itself. I found myself replacing it about every year in heavy use. A hassle to clean, too.
This griddle is so simple; nothing to go wrong, unless the Coleman stove fails and it hasnt in about 20 years. And you still get the nice grill marks on burgers, steaks and chicken breasts. Not as tasty as my mesquite grill at home but, hey, the limited storage of a TC forces compromises.