If you're into bands like massive attack, tricky, and other trip-hop artists and bands like coldplay (the vocals are kind of similar), you should definitely dig these guys. Both of their albums are really good. This one isn't quite as instantly accessible, but is definitely very good, actually I think I may prefer it over their self titled debut.
I first heard prism #1 and bloodstream, probably like most people who have hear these guys. To me their sound is actually pretty mainstream, but I guess they're just edgy enough to be on ninja tune and still underground. Ninja tune is a great label btw, lots of good artists on there.
They're sound is a little dark/emo at times, which may be a bit of a turnoff for some, but I think the quality variety and originality of the music makes it very easy to overlook.
To me this album is more varied than their self-titled debut, but also more uniformly good. I think that I like every track on this album, where the first was really more about the hits for me (exit, prism #1, bloodstream, and the track with Lateef).
If you're on the edge on whether the rest of the album will be good, just get it, you should be happy.