Is it good for couples and light sleepers?

Yes, motion isolation scored 7.7 out of 10. Each of the 630 coils sits in its own fabric pocket and compresses independently, so when a partner rolls over or climbs in, the movement stays local rather than rippling across to your side. The mattress is also quiet, since pocketed coils have no metal-on-metal contact to squeak. For a value-priced plush bed, that is a solid result for shared sleep.