All modern Hamiltons are also ETA ebauches at best, or finished movements.
My Hamilton chronograph for instance is a Valjoux 7750.
That said, ETA movements are tested and proven, and of excellent quality (especially the top grades).
One negative is they limit watchmakers, because the latter can't place the dials and complications wherever they want.
And the other "negative" is they don't have that feeling of exclusiveness and hand-made-ness.