As of February 2013 the service was available in 182 countries with the noteable exception of the US. A list of countries can be found on Deezer's developer website.
Normally a free account gets to use the (ad-supported) site for ten hours a month, at the moment however Deezer is promoting the service by making it unlimited for the next year (2013).
There is a way of getting the Premium options for free (see the video) but I haven't tested that myself.
- Compared to Rdio or Spotify it is striking how bad the search works for old releases: searching for "A Night in Tunisia" (old release by Art Blakey & The Jazz Messengers) will result in loads of re-released albums with the wrong artist name.
- When the artist name or track title contains an ampersand (&) then Deezer will not scrobble that along with the data, so instead of "Alison Krauss & Union Station" it will scrobble as the incorrect "Alison Krauss Union Station".
- Spotizr Use this for importing (your) Spotify playlists. It tends to work better with smaller playlists (<400 tracks). When the number of tracks is more then that the tracks will get split over multiple playlists. While testing this with a playlist that contained 2400 tracks however only the first 900 were imported (this appears to be the maximum number of tracks in a Deezer-playlist).