>> Can you list those features?
> One was already mentioned by Stephen Leake: refactoring.

Another is navigation to definitions. Last I heard, Semantic doesn't
understand C++11's "auto" keyword well enough to infer the type it
resolves to, and to enable navigation when auto is in use.

Semantic also doesn't find definitions across shared_ptr properly, eg:

  std::tr1::shared_ptr<A> a(new A);
  a->foo(); // I want to navigate straight to A::foo