Yeah. The job only takes about an hour. If the dealership had it in stock (no one apparently does) they would have been able to complete it that day. The dealership that took three days had to order the part, got it late on the second day and then didn't have time :S He mentioned that the new vehical, PDI guy was the one that installed all of the block heaters (surprised a regular tech didn't do it....).
I haven't really tested mine again but maybe I'll doublecheck. I know when mine was working and it was only about -12 to -15, 8 hours being plugged in virtually had the coolant at temp on startup! lol