I think that you definately have to be a fan of ambient music to dig this one. It's quite good in that aspect and I was listening to it while working and found it to be really good in the background. The fact that they have a new album coming soon tells me that they have what they feel is a crop of A-side tracks and I don't think the RR series was meant to deliver on that premise, although JAL To Tokyo was quite nice in that respect.
In all, I give this a 7/10, average. No way in hell though do I give this or any of the other installments higher, nor do I think they expect that I don't think. There were a whole lot of good ideas expressed though the various RR releases but good ideas don't always make good songs and I know this -- I have about 100 good ideas on my studio HD myself, and they're going nowhere.