I listened to "Blood Rain" on audio CD (8 to be precise), read by Michael Kitchen. It felt like Michael Kitchen took the first CD to warm up, his clipped English and occasional sighs being very off-putting and very out of place in that first CD. He seems a strange choice to read Aurelio Zen stories. However, after the first CD, his reading style felt better and the story flowed well. In fact, I would say that the story was very good - well written and interesting, with an unexpected turning point in the midst of the story. I found this intelligent but easy listening, and it had me gripped. And then ... the ending. What can I say? Well, after eight CDs, the last few seconds were hopeless - completely predictable (to the point of semaphored beforehand), disappointing after the good writing earlier on, not well read, and to cap it all for audio listeners - there was no silence at the end of CD 8 to digest the story before (in my car's CD player at least) the CD looped back to the beginning again and carried on playing. That last point may seem very minor, but it was annoying - I barely had time to think "was that it?" before my thought was interrupted by the start of the CD again. Twenty seconds of silence at the end is not a lot to ask for...
So, to summarise, eight CDs, first one not brilliantly read, but after that well read and with a good story, all capped off by a disappointing ending. I'd still recommend it (with caveats), but think it might be better in printed form than read by Michael Kitchen.