Incoming necrobump of proportions here; but I expressed an interest in this comp on the first page of this thread, though didn't get around to listening to it 'til now (in fact, I explored some other albums of Pärt's music before getting on with this one).
Let me just say the title track definitely deserves the position of being one of Pärt's most well loved and critically acclaimed works, even with its relative brevity compared to much else on here. Great choice by OH this. I was already familiar with the "Salve Regina" prior to hearing this, and I find it to be a beautifully soul-crushing piece of music. It's given a wonderful rendition by the Estonian Philharmonic Choir, as is everything else on here.
Some in this thread have remarked that they don't find the music to be captivating or engaging and implied that it's best suited as background music. On the contrary, I find Pärt's music to be extremely emotionally intense and attention-demanding, even in its most calm and contemplative moments.
All in all, a great set of excerpts from Pärt's choral catalogue. I'll be listening to this again regularly, I suspect, as well as continuing to explore more of his other works.