My thought has always been after xmas and potentially beyond the first week of January for a deterioration...but the big PNA is a surprise to me, and I would think that would be more fleeting.
I think the polar domain and EPO will take a bit longer to go to crap.
How are their graphics? I hate the color scheme...only thing that lures me is the quick data reception.
I usually do wxbell, which has great graphics, and Eurowx....which the best snowmaps and allows me to draw maps.