Well, My Propane Butler showed up at the door a short while ago with a full 30 lb. tank. They said a week ago it would be today, and they showed up as promised. The guy was really nice, and they only charged me $15 for having the old style valve. They had said $30. So I got a full tank of propane with the new style valve for $55.51. I'm very pleased.
I was curious how much propane it had in it, so I weighed it with our strain gauge bathroom scale. Based on the tare weight stamped on the tank, I got 29.5 lbs of propane. That's pretty full!
Now, this weekend, I get to install the new auto-changeover regulator I bought, and one of the hose pigtails. I'm pretty pleased with the outcome of this.