The soundtrack is generally recommended. There are some very good pieces (eg Thumbprint Killer, Unwelcome Partner). Others are on average arranged, but still fit well into the (dark) concept. The style reminds me of the soundtrack of "Fight Club", the well known, the Dust Brothers: have recorded (or better Chemical Brothers). Djawadi's Mr. Brooks, however, is more harmonious and less hectic. The Fight Club soundtrack is by the way, etc. regularly to dramatic accompaniment of Hartz 4 documentaries "Misused" :-)
To the film should mention that it's really worth to look at him. I've borrowed it with absolutely zero expectation and have been downright weggeblastert. A small masterpiece, albeit sometimes very psychopathic. Conclusion: film and soundtrack complement each other wonderfully, purchase worthwhile.