I was a very eager subscriber to classical music on Apple.  compared to the stock music app, though, it is very disappointing. In fact, most of the time I would rather just review the Classical pieces on the stock app. 

Here’s why:

• The classical music app is not available on Mac or Apple TV. So, if you want to see your listening history, you won’t be able to view it on those devices. 
• The naming and organization, which is the problem they were trying to solve, is not improved in the classical music app. 
• I have seen some mislabeled tracks on the classical music app. This is possible in the stock music app, as well, I just haven’t noticed it.