How well does it isolate motion for couples?

Very well, scoring 9.4. The 1800 coils are individually pocketed, so each compresses on its own instead of passing a bounce along connected wire, and a micro-coil layer above catches finer movements before they spread. A partner climbing in or rolling over on the far side will rarely wake a light sleeper. Because the surface is firm and springy, it transmits slightly more than a plush bed, but isolation stays strong, and the pocketed coils run silent.