Let's start with INCREDIBLE...
I've just been reading through some of this albums reviews on here, and as far as I can gather, the majority of people seem hung up on comparing to the acoustic cover of 'Heartbeats' Jose Gonzalez released in 2005. Impossible. Both are great versions of the same song, but I feel it is wholly wrong to consider approaching The Knife with anything but an open mind. Essentially, they may as well be different songs because they take such completely different approaches to the melody.
As a big fan of all three Knife albums, and this years 'Fever Ray' (the solo release by Karin Dreijer Andersson), I must stress that The Knife are EXPERIMENTAL-electronic at it's most original! Listen to it with a mind free of all expectations, and you will pick up on the subtle quirks that give this band it's unique personality. I also highly recommend their eponymous debut album, and Silent Shout. There's a gradual shift in tone as the band ages, where the sound becomes darker and more dreamlike, and again this is notable in the 'Fever Ray' album.
If you have an open mind, you may very well fall in love with this band as I have. If you are expecting plain straight-forward mainstream pop, you are listening to the wrong band.