Is anyone using those. In my experience they are totally broken. They do not support filtering/searching (on desktop) and take ages to load. When I want to look for an artist/albums in my library what I am forced to do is go the the "Songs" section, hit Ctrl +F and type there. From UX the whole searching/filtering on desktop is completely broken, if you don't know the Ctrl+F keyboard combination then you can search at all.
Please have a look at searching in "Your Music" and make it more useful like it is on mobile and for the life of me take a look at the loading performance of artists and albums. Having to wait +10 seconds for the section to load is unacceptable.