If you are even a marginal driver that has a tendency to hit the wall or somehow always get tangled up on the track with other car, stay away. They might resist flexing, but once they bend, they are done.
I really think the chassis are a sales gimmick for this reason, thicker carbon lower and upper decks could accomplish the same thing, but not sell as many damaged replacements. To try and stiffen the chassis, try things like using all the chassis stiffeners that come in the kit, or solid toe blocks vs split blocks.