php - Do you use repositories in Doctrine2 and Symfony2?

I'm trying to find the best way to design my application and precisely my domain model.

I took a look at most of FOS*Bundle and they abstract the things like this :

Model/
- AbstractUser.php
- AbstractUserManager.php
Entity/
- User.php
- UserManager.php
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They don't use Repository at all and all the work is done in the Manager classes.

I used to do something similar but in a different fashion.

I didn't abstract the domain model with abstract and interface (well it looks that it is definitely the way to go) but I had only Entities (the main goal of FOS is to be storage agnostic and allow the use of ODM or ORM).

So I've such structure:

Model/
- Entity/
-- User.php
- Repository/
-- UserRepository.php
Service/
- UserService.php
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You bet it, theUserService is similar to theUserManager in FOS but it is mostly a Proxy class to theUserRepository.

What do you think?

How do you organize your domain model, do you have any feedback?

Do the FOS fashion the way to go?