Do you make use of this service? How is the audio quality? I know the search feature is very lacking.
The tagging is a nightmare, and composer data is usually missing. I don't think the audio quality exceeds 128kbps MP3 on a free plan, though the most expensive premium one offers 320kbps. No lossless though.
Spotify is very good for classical music. I have the Premium 320 kbps plan and the sound is infinitely better than their free service. Tbeir range of classical is huge though you won't necessarily find the more obscure labels there. One notable omission for me is APR. However, as I use it for more than classical, I am very happy with it for $11 a month.