In reply to Doug:
I think it does vary. The day we were on it the conditions were just about perfect all the way up the snow was nicely frozen and no doubt one could have run it it in about an hour. We took a more leisurely pace, had a right laugh and generally enjoyed ourselves. There were only two real pitches and both were quite short and although a bit lean and well used there were no rocks poking through the ice. For us bumbling mid grade climbers they were enough to make the really worthwhile.
I found it quite an atmospheric route passing through some good scenery and as you get higher up the vista outside the gully comes into play. This is most notable on the top pitches when you can see out of the gully and look over to see all the high peaks. Fantastic day out but we were blessed with perfect conditions, I wouldn't want to be in the thing in fresh snow or when the wind was pouring spindrift down it.