I know and have Nestorovic products since 1992. At the moment I have 2 systems 16 (the latest and second latest version, one without subwoofers), 2 System 5 (esecond latest and thirs latest) and 3 pair of his tube amplifiers NA-1.I go practically every week to large orchestra concerts and can say for my ears, there is no other system I have heard that sound closer to my life experiences than the system 16 with updated NA-1 and very top other components (sources and pre-amps).
If they live up their price depends in which condition they are and on your ears.
At the moment I wouldn't even think of selling my equipment. If you need precise details on the sound I have here I will write something. It will exclusively be concerning classical music.