They have just a couple of these new planes and generally they do MAD-EZE or MAD-SCL, but you won't know until they assign that aircraft to your flight.
You may get lucky.
I've flown in these a couple of times, IMO...no difference with the "normal" 350...
the best thing is that I could connect my bluetooth headphones to the TV screen.
The door and rest of new things....meh....