Abbeys were finalists on my short list of speakers for the room in which I subsequently chose Druids. I bought the Druids blindly after hearing the Abbeys on equipment I don't own and concluding that the whole Fostex approach just doesn't have enough latitude to be convincing to a music omnivore like me. I consider the two speakers competitive only on the superficials: similar footprint, high efficiency, full-range drivers, tall stance. On sound, the Zu matches the Abby on speed, trounces it on frequency extension, projects superior acoustic power into a room, sounds tonally more natural (and accurate) to me, and is altogether more convincing. Perhaps on small-scale very personal music, the Abby has an edge on palpable intimacy, but that's a bone to the Abby. The Cain & Cain sounded enticing, intriguing and oozes retro cool. But it has a way of just sounding old, which is not the same as better, when something inspired by forgotten research and updated with contemporary thinking and materials enters the stage, as the Druid Mk IV has. I wanted to prefer the Abby over Druid, and it costs less, but I judged it just not in the same class as a holistic projector of music fidelity in normal rooms.
Phil