Only a month in, and I've been exploring AM with an open mind. I'm a long-time Match customer, and honestly, I haven't run into any problems with AM. I did back up my library to an external drive, just in case.
I love being able to download the curated playlists for offline use. I'm often in situations with no or very poor network coverage, so having a great selection of playlists I've downloaded already is fantastic. If something comes on that grates on my ears, it's easy enough to hit Next Track.
The For You tab has been kind of neat. Picking out music should be fun, and this brings that joy back... like browsing the aisles at Tower Records back in the day.
Unlike a number of the complaints posted, I have no delusions that the offline downloads are mine to keep. They are simply a form of cached streaming, akin to rented/borrowed music. If I don't renew my subscription, those need to go away. Then again, I used this feature in Slacker for years, so understood the limitations and expectations.
Beats 1 has been a hodge-podge. I tune in now and then and will hear music I don't really care for (rap/hip-hop). Other times, I'll tune in and be surprised by something I like. The Mixtape show is pretty neat.