Definitely worth having if you're interested in the development of piping techniques; Seamus Ennis had a very individual style, and has been a big influence on later players.  Many of the pieces on this recording are quite unusual versions.  So far as I can remember, it was originally issued as a double (vinyl) album in the 1970s, with an additional track not mentioned at the Green Linnet site (two reels: The Braes of Busby and Colonel Frazer.)  Ennis was also an important collector of folk song and music.  Two of these tracks, First You Must Learn the Grip and Don Niperi Septo are stories told by Ennis.

Malcolm