I’ve heard Druid, Omen, and definition models most recently and many others whose names I can’t recall. I very much like the vivid, exciting sound they deliver (something often missing in modern speakers), but the sound was too sibilant, lean, and edgy for my taste. Others may like that sound, or accept a shortcoming because its strengths have high priority, but one must hear them to make the determination. All speakers should be auditioned, but certain speakers are particularly polarizing because they sound quite different from the crowd; Zu’s are in this group.