It felt slower in transition.
As Adam said. (Thanks)
Thickness of the 3.0 top deck is 2.0mm (401495), but it also has the front opened up, or considered the super flexi deck. The 1.75mm (401563) is the full filled front deck same as the 2.0mm deck (401374).
As much as I'd like to say that you can convert the 2.0 to a 3.0, (and all the parts will fit), I do think you'll not get the full advantage of the lower mass weight that the aluminum chassis creates.
I also forgot to mention as Cody said, I manged to put the car off the wall a few times at speed and found that the chassis is more than durable and doesn't take on a tweak with other hits either.