Are the DLC worth it? Is my save of FFXV "normal edition" compatible with Royal Edition?

[Lezonidas]

I mean, should I have to restart the game if I buy the Royal Edition? I played the original game and platinumed it 3 years ago, now I see it sitting at 45% completion, I'm not going to 100% it, but I'd like to play the Royal DLC and all the "Episodes" DLC if it's worth it. What do you think? Are trophies of those DLCs enjoyable or a grind?

[Karnacharya]

I can only speak for myself, but yes, absolutely. Final Fantasy XV's DLCs aren't perfect, but they boast two of the best fights in the history of the Final Fantasy series (Ignis vs. Noctis, and the Omega fight). The Gladio vs. Gilgamesh fight is also quite good, and the bits of story that each of the DLCs add to the overall narrative makes them all worth getting if you liked the original game.