Everything in this threads first post rings true. No BS, not even a whiff.
I've been at UPS for 23+ years. I originally took this job waiting for my "real" airline job offer in 1990. I've pretty much seen it all, starting as an F/E, flown domestic and international as an F/O, and been churned as a junior captain collecting four type ratings along the way. I've done union work in Grievance, sat at the negotiating table, and walked the picket line in support of the Teamsters in 1997. Read the original post carefully, because I certainly couldn't add to it. It's all true.
If you want my opinion, I'd take this job in a heartbeat, and if you don't like it move on. It's just a job. There's no glamour in it, just good money, great flight crews, and an awesome union.
Feel free to PM me if you have specific questions. I've got loads if time on my hands.