Xuacu Amieva's book was on clearance a year and a half ago, so I'm not sure it went over well in Asturias.
I've got the book but haven't spent much time with it yet. It's very thin. It does come with a disk, though, so (if I recall correctly) you can hear the tunes and ornamentation. That does help!
I've heard Xuacu play several times. He's excellent, and seems to be a generous person. In fact, he was one of the people who worked to save the Asturian gaita and traditional music from extinction. That alone makes him an extraordinarily good person in my book!