Did mine this afternoon. Took advice from a blog, and, instead of calling, I went to cadillac.com and used the live chat to make my appointment. That took about 10 minutes total.
Went to the dealer, talked to a young guy who entered my info to get me the credit, and then, very frankly, said that if I'd like to see/drive one of the cars, no problem, but if all I wanted was the miles, no problem, either.
I looked at a couple of their cars, and talked about what I'm looking for (really, I want a Prius V, not a hybrid Cadillac coupe for $70K). Thanked him, went on my way. Was in and out in 8 minutes. Faster than a flight to Italy!