Rising Tide is really fun and went in some cooler directions than I expected. They've also made a tonnnnnnn of QoL updates to the main game. If you've somehow not played XVI yet then there's no better time to dive in.
Unfortunately, I felt exactly the opposite. It wasn't bad, but rather average, and I'm really disappointed. I really feel that they haven't learned anything from the "problems" of the base game. The side quests are poorly designed. The story is okay, but it's sorely lacking in party involvement. Jill got robbed AGAIN (I'm really pissed).
The location is beautiful. Exploration isn't very interesting (very narrow and linear) but I love the landscapes. The new gameplay additions are really cool.
If you weren't thrilled with FFXVI OG, this won't change your mind. If you liked it, I think it's more or less the same, so you should enjoy it I guess.
Not the goodbye to FFXVI I was expecting...