I’m using it, it works well, but I haven’t used a different one for a few years to really compare it, it doesn’t go back to chart songs but I have a lot of saved music for it to choose from.
I like (some might also be on other apps)
Quarterly rewinds with stats and top 100 playlists etc.
Now has a sleep timer, finally.
Download listened to songs at random for offline, you choose the number/storage usage.
Find a song and press play next ( Spotify adds it to the end of your current queue I believe)
Can add live and remixed song versions from YouTube, which is great for songs not anywhere else.
Stats for nerds is also available like YouTube 
Can quickly switch to the music video of the song you’re listening to, plays it in full HD too, just like YouTube.
Usually has the song release year when you click 3 dots and then credits, I use that to see if I feel as old as I am.
Seems to have more song lyrics than Spotify, even if they don’t all scroll along in sync with the words.
Public comments on songs.
Samples is also good, it’s like Instagram reels for music videos , scroll through suggested short clips from music videos and add the song to your queue or playlist or just play, but I don’t use it often .
Some gripes;
Shuffle tries to be a bit clever and concentrate on recently played songs from a playlist(maybe I’m imagining it)
Sometimes it’s not actually endless music, I’m not sure on the pattern but it can stop playback after 50 or so songs, it’s annoying, I think it’s when you click on a single song and it starts a radio.
It definitely doesn’t seem as feature packed as Spotify but realistically the app is just in the background and playing music and if you go YouTube premium there’s no ads in YouTube which I really like.
I don’t like that I have to sign into my whole Google account to play music, i.e. work computer, so I have it on a separate email, so I don’t leave access to my emails and docs on devices I don’t want to.