Really great! I've only used 4 times so far, in those times it worked, which is already great, but it was also really fast, 100% reliable and the UI is just great.
Viewing a song from the history, in the popup, is a little annoying, since I have to click on a fairly small icon, which is right next to a deletion button btw. I feel that could be improved by doing the same that happens when clicking on the eye icon when clicking on the song name, cover, etc.