Fragments is probably actually my least favourite, but agreed that all 4 albums are amazing. They've become one of my absolute favourite bands - I haven't heard any other downtempo/electronic groups that have nearly the same warmth and atmosphere in their music. Alium is another great addition!
Went to their London gig a few weeks ago, but was hugely disappointed by the sound. I think it's entirely the venue rather than the band (a friend of mine went to another gig the week after and had the exact same thing) but it was just so loud it made us feel ill. First song or two the bass was overpowering and distorting everything, so the sound guys seemed to balance it out by turning everything else up, which just made it sound and feel horrible. We had to leave after about half an hour. It was such a shame as they create such wonderful music, but they were massively let down.