Also CBP doesn't recruit using flyers on pizza boxes, so the quality of employee is a little higher.
CBP officers are often cranky SOBs. The ones I've had to deal with at the Rosemont, IL office that deal with trade issues are massively cranky. I swear the cranky attitude is issued to them along with their uniform and handgun. You'd call and before you can even start talking, they start snarling into the phone. The ones in smaller ports of entry, such as as Int'l Falls, MN or Cleveland are much more pleasant.