I've only spent about 7 hours in the game, but those 7 hours have mainly been grinding the first few sections to level up some of my spells to turn them into higher versions of those spells. I'm technically still in the first Avalon Pacts section.
I'm usually not one to get into grind heavy games, but there's something really satisfying about boosting my skills, then fusing them into more skills, then boosting those. I haven't played online yet, because I'm mainly a single player gamer, but I'm really enjoying the game. I may have to put it on the backburner for a bit, though, as I didn't realize how time intensive the game was going to be, and I'm much closer to completing Persona 4 than I am to completing this. I'm very satisfied with my purchase, that's for sure.