In reply to JamesM:
The route was in good condition over the last two weeks (I've done it twice)but is getting dry very quickly. I think it needs more snow now (which it will be getting at the moment).
There are so many variations it is hard to be precise but there is a pitch of VSish on the gendarme before the Fleche Rousse but you can avoid this.
The Fleche Rousse itself has a nice mixed pitch and steep but easy finish. Thought it was easier than VS. All in all a standard AD route and easy for Chamonix where they can be a bit harder.
Great hut also with lots of rock climbing around.
Lastly, the descent has to be in good condition or you could be stuffed.
Tim