Awful. Just a flat out awful UI experience. I don't need the app to necessarily support every esoteric thing on the web site. I do expect it to give me the option to choose a new language course, or set up what kind of questions I want. And get this, when I tried to go to the website to switch languages, it just opened the app. Had to use backhanded trickery just to be able to get to the website without it opening the app, just to choose a language. (Upd: app WILL NOT respect no listening sttng)