Stranger things seemed pretty underwhelming to me initially, but I played both a premium and pro a good bit recently and found them actually pretty fun - solid game imo. Not sure I'll own one, but the projector and uv stuff was really cool indeed.
Mando I did dislike though - I just wasnt enjoying the modes, and that repeated, easy shot to the center for every standard multi ball was really no fun at all. I liked the idea of the swinging razorcrest target, but in practice didn't really feel like it amounted to much. Maybe some changed/improved code will spruce it up. I was also surprised that the callouts from Carl Weathers were pretty lame. Bad direction and lines or something, which is a shame since having an actor from the show doing custom callouts is I'd consider the best option - vastly preferred over BS impersonators or made up characters. These are just flat.
Come to think of it the callouts in Stranger Things were pretty awful too, from a major show actor/character as well. Not sure what happened with both...