I recently received one as a gift, and I REALLLLY like it.
The thickness of the metal is a lot thicker, so it retains more heat and makes nicer grill marks.
I'm assuming it will be more durable as well.
The insert system itself is pretty cool. I only have the griddle, which I've used a few times to fry a few things.
I personally think the sear grate is poorly designed. The spacing is too large for many cuts of meat, so you'll really only get attractive marks on larger cuts. I've seen the marks on larger cuts and they're nice - but with the size of the sear grate, only one large cut will fit on it at once.
I think the actual removable center system itself is useful, even without inserts. The hole in the center is perfect for the performer. Using baskets, I simply remove the center, add a couple fresh briquettes of coshell to each basket, and relight whatever I had leftover. If i want all the heat off to the side, I move the baskets without removing the grate (only removing the center).