Observer pattern vs Event Bus message approach?

I've been looking at MVC implementations and EventBus closely.

I am wondering why not use EventBus instead of Observer Pattern to implement a MVC application?

For example, lets say I have two classes Model and View, In typical observer pattern it would be:

public class Model implements Subject { ... }

public class View implements Observer { ... }

Instead, what is the beneft/drawback of an approach using green robot event bus or any other EventBus?

It would be something like:

public class Model {
   private int field = 0; 

   void someFunctionNowTriggerStateChange() {
     this.field = field + 1;
     ...EventBus.getDefault().post(this); //pass itself as the event
   }
}

public class View {

  @Subscribe onModelUpdated(Model model) {
    updateTextLabel(model);
    //other model updates
  }   
}

What are the issues (if any) of using the EventBus to implement MVC vs typical Observer?