Yes had my 2014 CC Sierra Z71 bought back in August after battling vibes for a year. Full buyback including payments for the year. I had the steering wheel vibes between 70-90km/hr. RF balancing, new tires(Michelin), new rear end, new upper steering shaft. Nothing changed.
Went to arbitration and arbitrator drove vehicle and immediately acknowledged vibes.
Long story short bought a Ram Laramie and still love it. Would have bought a Tundra but can't get a crewcab with the bigger box.