It's been really great.
It's also helpful when they do these "get points, do a gacha!" thing because it motivates to play. When it's the "reach 50,000 points!" and you only get 1,000 points per, you think to yourself "um... I ain't playing 500 times before the end." and you give up.
Also new song on the 19th, that's super exciting! I hope it's as hard as WANT ex!
I'm sure they're gonna start releasing more "ex" songs as time goes by.