A$700 is well below the new price of A$2,499 and also under the current A$1,699–A$2,999 pricing I’d use as a rough benchmark for Helsyn’s woven AT screens, so this looks like a strong buy if the frame, fabric, and masking are all in good shape.
What makes it worthwhile is the core value of an acoustically transparent woven screen: you can place speakers properly behind the image without sacrificing a dedicated cinema layout, and Helsyn’s woven AT models are sold as premium fixed-frame screens for exactly that use case. At this price, the big upside is simply getting into a large 165-inch scope screen for a fraction of replacement cost; just confirm there’s no waviness, stains, edge damage, or missing frame hardware before you commit.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.