I agree with GCutforth - an awesome climb. The Grade 4 is the Guidebook doesn't refer to the two pitches we climbed. It notes that the first ascentists didn't climb these pitches. The guidebook description is hardly recognizable to the actual route.
It's a lot of work to get up to, but the upper pitches are worth it. This is graded 4 in J.Josephson's Waterfall Ice in the Candian Rockies, but it seems like a solid Grade 5 to me.