I love it, even though I find it kind of troubling.

Because of the turns of plot or imagery, or because of whatever they say?

It's been a long while since I've seen it, but as I recall, there is some weird stuff around the two men having this struggle for possession of Ada, and I wish that she had been a bit more active in making her choice. And then, of course, there's that one extremely disturbing scene (which is why I haven't watched it in a long time).
But the whole thread of Ada's relationship to her piano and her music, and how much the other character's reactions to that reveal about them is so wonderful. And the scenes of Ada playing the piano are so beautiful and real.