The first ascent of the route was made my Patrick Gabarrou and Francois Marsigny in July 1984 as an ABO A2/A3 (Abominablement difficile).
In 1990 it was climbed free bt Alain Ghersen and Thierry Ranault who gave the hardest pitch 7c. It has since been soloed by Jean Christophe Lafaille in 1990 and first onsighted by Denis Burdet and Nicolas Zambetti in 2002.
Even though the free grade has now come down to 7b+ it's still a formidable undertaking to climb given the elevation and the fact that the crux pitches are often wet or icy.
The first half of the route offers mostly easy climbing in the 5th grade with only a couple of 6th grade pitches. However...the rock is very lose.
After this, the quality improves considerably, and so does the difficulty. Technically demanding climbing in the 7th grade follows, with the crux section being the two pitch big overhanging dihedral.
Nina needed three days in total and climbed the route in "alpine, sport and ice style, leading and onsighting the pure climbing part".
As far as I can gather, Nina's was the first female free ascent.