Are NexGel mattresses good for couples with a restless sleeper?
Yes. NexGel mattresses are good for couples with a restless sleeper. NexGel's mattresses overall should provide a good solution because of the materials that the mattresses are made out of happen to be ideal for isolating motion.. think memory foam.
NexGel has many mattresses and series for you to browse. Check out the Sweet Morning Series, that's the one that was designed especially for motion isolation.
But, all in all, NexGel's mattresses are good for isolating motion. As a general rule latex and memory foam are the best materials for limiting motion transfer.