Got to ride it twice (technically as of posting this) yesterday, absolutely loved it. Very classic Epcot while still feeling modern.
Also, for me at least, the star of this update is the two new narrators, your guide and Eco (the vehicle's computer). Not only soothing and enthusiastic voice-acting, but the two have a weirdly very nice chemistry, bouncing off each other (especially in some audio that plays when the vehicles get backed up, they start joking around with each other and it just felt nice).
Overall, very vibey and great upgrade. Love it!