Just did one yesterday in Southern California. This time I got to be a passenger, and checked the trays on the second row while the car was in motion. Works well and isn't wobbly at all, however if the driver takes a harder corner turn devices like phones or tablets will slide off the notched plastic area since the plastic is slick. They should put a rubber insert into that slot for more grip on the device, but you can of course do that with aftermarket parts. Or you can have a suction mount which will also work.
Some quick thoughts: The 2nd row lights have a dimmer functionality. Also the screen that controls AC was very responsive. The 2nd row windows can only go down roughly half of the window height. Lots of legroom and the third row is still massive, easily bigger than the R1S.
One interesting thing is that the SA seemed confused there wasn't carplay in the Gravity yet. She said she got to try it at the last auto show and it worked well. Maybe a beta build was shown there? Or perhaps she was confused. TBD