NES-3002 is very similar to Harmonic Tech Pro 9 and Pro 11, with the construction being almost exactly the same except for the conductor size. NEI-3001 has a nice rich tonality and solidity, with good full bass, but can tend toward sounding a touch thick, although a preferred option to some high resolution cables I have heard that sacrifice tonal density for detail and end up sounding thin.
I find the comment about a dealer liking NES-3002 better than NES-3001 interesting since the construction is totally different. The 3002 is a twisted pair while the 3001 is woven around a core, although both use individually insulated solid core OCC conductors. I believe the individual wires in the NES-3002 are insulated with a foamed polypropylene (at least the HT wires I have taken apart use foamed PP insulation), which I tend to prefer over Teflon (which is used in the NES-3001).