I'm 4 for 4 so far on my YOW-YYZ-YOW, as a lowly *P this year, but they have all been booked 2 days out on a flight pass and cleared as soon as I booked them. I did have about 30 expire at the end of February after nominating my sister and her co-worker who were trying to get YOW-YYZ-SFO the last week of Feb upgraded with ZERO success even at T-4 on latitude fares.
I'm pretty convinced AC was blocking seats so that all those e-ups would expire. I checked their return flights first week of March and they were both wide open.
Oh well, on the plus side, I'll be at 8 segments for 2012 by the end of next week and I frankly don't miss flying every week one bit!!