The Bears traded down from the pick they got for sending Miller to Houston and drafted Braxton Jones and Trestan Ebner with those picks.
That's a good haul, especially since Jones is making a strong first impression. The Texans got 2 games out of Miller before cutting him.
Braxton Jones has been talked about as a potential starter at left tackle as a rookie and Ebner's speed alone will help him have an impact. The running back should earn reps early on as a change of pace back and on special teams.
For now, this can be deemed as a good trade for the Bears but only the future will actually determine this.