One of the things that I found surprising in the article about White Grizzly was the reference to 1000 metre runs with a half hour cat ride back up. A 1000 metre run would be close to 3,300 vertical feet and I think would take longer than a half hour on a cat road to get back up top.
I have cat skied with Retallek, near Nelson and K3 near Revelstoke and at both operations most of the runs were 1500' vertical with some 1000' and some 2000'. Part of the reason for this is that anything longer means a very long cat ride back up top. We got between 7-8 runs and 10,000 to 13000' vertical each day.
While the snow may or may not be deep, the one thing that a cat ski op can offer is untracked turns all day long. On both my cat trips there was virtually no new snow the week before my trips or during the trips yet the only tracks we crossed were our own. Most of the runs were boot top settled snow but the guides did find us some knee deep snow and thigh deep but heavy old snow for part of a run.
One thing to keep in mind when booking a cat trip in Canada is the limited amount of daylight in Dec. and Jan. You might be able to squeeze in an extra run with the longer daylight hours in Feb. or early March. From mid March on is low season with a greater chance of mild weather and some steeper runs closed due to increased avy danger in the Spring.