How good is it for couples and motion?

It is solid for couples, rating 7.8 out of 10 for motion isolation. Because it is all foam with no springs, movement does not transfer through coils, so a partner shifting causes little disturbance, and there is no spring noise to wake anyone. It is a firm foam feel rather than a deep memory-foam hug. For a firm sleeper sharing the bed, the quiet, stable surface works well.