How well does this plush hybrid isolate motion for couples?

Very well, scoring 7.8/10. Each of the 1000 pocketed coils sits in its own fabric sleeve and compresses alone, so a partner's roll-over is not telegraphed across the bed, and the memory layer absorbs the initial jolt at contact; movement settles in about a second. The honest caveat: the natural latex on top is livelier than memory foam, so it carries slightly more surface bounce. For a plush hybrid the isolation sits just shy of pure memory foam.