Digital Dance to me is probably one of their worst albums, I remember getting it when it first came out and being disappointed. Their earlier albums are their best IMHO. My personal favourites are Beam Scape and Night Light.
I wouldn't have classed them as Vapourware, I tended to think they were sort of modern Berlin School, at that time, using digital instruments to provide teutonic soundscapes. For me they went off the boil after Syn Code.
And yes the saxophone is bloody terrible!