Is the plush euro-top a good mattress for couples?

Yes, especially for couples who want a soft, shared surface. It scores 7.9 out of 10 for motion isolation, but its 416 coils are a connected tempered-steel unit rather than individually wrapped pockets, so some movement carries across the bed. A sound sleeper will not notice, though a very light sleeper beside a restless partner will feel more bounce than on an all-foam bed.