Version:            (using Devel)
OS:                Linux
Installed from:    Compiled sources

This is a real nitpick, but anyway:

Say the .h has the following function

void foo( int bar );

And the .cpp has the implementation:
void foo ( int bar )
{
  [..]
}

Now if you remove the argument from the implementation, the assistant offers to update the declaration, which is really really nice.

However, it has superflous whitespace in the .h, like this:
void foo(  );

It should be:
void foo();