A very solid core. Pricey. All of the best stuff, musically and chart-wise, comes from crossover packs- the actual MUSIC in the base game is mediocre modern rhythm game naptime. I miss when the default genre for rhythm games was eurobeat...
The ability to play every song in 4, 5, 6 or 8 button is neat in theory, I think, but I've never really understood the appeal of 5-button and 8-button has always felt really awkward to me. 4-button is a bit too simple and easy once you're experienced but it's a great on-ramp to learn. The issue is, in practice, I enjoy 6-button way more than anything else, but not all songs are playable on all difficulties on all button modes, making the song list sometimes feel artificially smaller. Your mileage may vary on that, if you like the variety of trying different control schemes it means you're getting a lot of bang for your buck with a ton of different charts available for each song.
The ability to play every song in 4, 5, 6 or 8 button is neat in theory, I think, but I've never really understood the appeal of 5-button and 8-button has always felt really awkward to me. 4-button is a bit too simple and easy once you're experienced but it's a great on-ramp to learn. The issue is, in practice, I enjoy 6-button way more than anything else, but not all songs are playable on all difficulties on all button modes, making the song list sometimes feel artificially smaller. Your mileage may vary on that, if you like the variety of trying different control schemes it means you're getting a lot of bang for your buck with a ton of different charts available for each song.