I’ve been using it for about half a year and I’m really liking it. At it’s basic form it’s pretty much like SAI, but it just has a lot of extra features. There’s even a 3D posing model setup where you can put a 3D model in your piece to use as a reference or how ever you’d like, there’ are tons of features for printing too, and various other useful features. It’s not that hard to learn the basics, but with it having so many extra features, learning all of them can feel a bit daunting.
I’d say download the trail version and give it a go :)