At A$390, this is well below new for a Level 1 Atmosphere cable, which sat around US $695 for RCA or US $895 for XLR at launch; that makes the asking price look like a strong buy rather than an ambitious one. Against the used evidence here, a 1 m pair sold at €539, so A$390 is comfortably on the attractive side for a very_good listing.
What makes it worth chasing is that Synergistic’s Atmosphere line is generally prized for a clean, open presentation with good refinement and a bit of that “lift” high-end cable buyers are after. If the set is complete and the terminations are clean, this is the sort of purchase that makes sense for a system already sorted elsewhere. The main thing to verify is length, connector type, and that both ends are original and undamaged, since those matter more to resale and compatibility than cosmetic wear.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.