This is the new hinged SS Weber grate ordered direct from Weber. It does not have the chrome like finish that the standard plated hinged grates have.
This is the new SS grate next to my 17 year old standard grate. As you can see, they are constructed of the same gauge metal. The old grate has held up relatively well except for the hinged areas. I cook mostly indirect and these areas are usually positioned directly over the briquette baskets. The hinged areas are now extremely rusted and I do not let any food come in contact with the areas. Only time will tell if SS holds up better.
I also have one of the new gourmet system grates coming and will post a comparative photo when it arrives. I have seen one and they are constructed of a heavier gauge. I assume it is because additional strength is required due to the center being cut out.