Using Value Objects for modeling concepts in your Domain that measure, quantify, or describe is highly recommended. As shown, Value Objects are easy to create, maintain, and test. In order to handle persistence within a Domain-Driven Design application, using an ORM is a must. However, in order to persist Value Objects using Doctrine, the preferred way is using embeddables. In case you're stuck in version 2.4, there are two options: adding the Value Object fields directly into your Entity and mapping them (less elegant, but easier), or extending your Entities (far more elegant, but more complex).