Thanks jc94, very useful discussion here. Agreed that sometimes the kiosk is faster. Though it's great to have PCI as option, especially when you're running bit behind and facing >20 minute wait for bag drop.
Another advantage of P25k is that you're less likely to get bumped vs. non-status fliers. This saved me on a YQR-YYC trip when the aircraft got downsized and my initial seat vanished. Would have otherwise had to spend night in Regina.