RCBS CS is the beez neez. I somehow misplaced the .10" thick spacer ring for my .357/.38 Special die set and could not find it listed in the catalog. I called them about it and the guy immediately said "give me your address and I'll send you a couple for nuthin'." I tried to insist on paying since it was my fault. He wouldn't hear of it.
Right after they arrived I found my original and now I have three.
On another occasion I broke the leaf spring on my primer arm, phoned them and one guy got one in the mail right away. A few days go by and I call to check and talk to another guy explaining that I want to check to see if it is mailed. He said "not worth the trouble to check, I'll send you one myself and maybe you will end up with a spare." Sure enough, two seperate envelopes eventually arrived.
The good news is I rarely have to call them because their tools are so good they rarely need any CS. But when I do, they are the best!
Dan