I have a Sony MZ-NH1, and it does make very good recordings. BUT my Sony WMD-6C with metal tape makes better recordings with amazing dynamic range and NO noise using Dolby C. Problem is nobody is making metal tape now, dam it. Still, Sony's MD format is a great medium for live recording, and is small enough to "sneak" into concert venues where other, more bulky devices might be detected. Gotta use those microphone glasses!
Kevin