I haven't but I saw the damage of having union in an open shop. I was working in the oil field and spent some time in the plant seeing the stuff being made. I was watching them build a mud pump. There were 7 or 8 guys working on the pump but they all had to stop because the union welders were taking their time to get there to remove some lift tabs. All these guys had welding experience and could have removed these tabs. They had let the welders know when they would be needing them. The guys waited doing nothing for 45 minutes to an hour. The welder finally got there and was done in less than 10 minutes.