While I know lots of folks seem to dislike/hate it for technical reasons (like the Mibox) - I've been running Oreo on my Shield TV for about three weeks and I absolutely love it.
The dashboard has far more usability now - I love having my Plex and Netflix recommendations separated on their own ribbons. I feel like this interface is far more useful and usable.
I like it, too, but would like the channels to be better supported. I have a couple apps I frequently use that don't have a channel at all (Prime Video, FuboTV). Also, it annoys me an unreasonable amount that the first item on the Netflix channel is for switching profiles. I don't need that right there.