Yes, I left UPS after 10 years. There were many reasons...mainly my health. The job was killing me, never able to turn my body clock around from night to day. It cost me a marriage and was costing me more in health and stress. The company truly breeds a culture of hate toward it's employees. Most folks just let it roll off of their backs, I couldn't do that anymore. I got to the point that I simply could not continue to live that way. For me...it was a terribly dismal existance. So, in the end, I quit. The money was no longer worth it because I truly knew that I would not live to see my age 60 retirement.