I've been using Deezer for almost a year now.

Things I like:

• Duo subscription is suitable for long distance couples (this was the main reason I subscribed to Deezer and not Spotify).
• Wide range of songs, even some pretty rare gems are available there.

Things I (we) don't like:

• As others mentioned, discovering unknown songs is not really a thing on Deezer. Spotify was so good at giving me other songs than what I used to listen, and it aced it. Deezer cannot do that. It only has predefined lists with songs that everyone knows ("hits" in other word).
• My girlfriend sometimes experiences lags, so probably in Asia they don't have servers.