In reply to Fredt:
> Has anyone used this track? How does it compare in difficulty to the original route?
It is more demanding than the normal approach. More uphill and much more ladders. But it's a very nice route. If your friends can handle the normal route without any problems they can handle this one too. It just takes more time.
The route is called Balcon de la Mer de Glace, so google with that.
I've done it twice and in September 2006 it looked like this:
http://www.flickr.com/photos/hukkis/sets/72157604915572602/
The route goes below the Charpoua hut so you might want to visit that one too. The location of the hut is spectacular:
http://www.flickr.com/photos/hukkis/414546726/in/set-72157604915572602/
The guardian leaves the hut before September but the door is open and it serves as a winter room.