In reply to JJL:
I've done it - memory is a bit hazy as it was a few years ago.
Not sure if June is too early, I did it in mid-August. The descent was a couple of abs off the back and a walk around and down past the Vajolet towers. I guess this could be snowy early in the season?
We weren't allowed to drive up the valley from the main road - you have to get a shuttle bus up to the hut. If doing it in a day without staying in the hut, you have to motor a bit I think to make the last bus back.
Tech crux pitch is low down and friggable on pegs, but there is a lot of climbing at a slightly easier level which isn't pegged to buggery. Took a reasonable rack, maybe 4 cams, a set and a half of wires and plenty of long draws, possibly a couple of hexs. It's got quite a few crack/chimney pitches but is pretty varied. Route finding seemed pretty straightforward if you get the switch between crack systems right (you move rightwards at some point). Enjoy, it's a fantastic route.