I climbed the route in July 2007. We started at 6 in the morning. Perfect weather with clear sky. The ferrate is not too hard, but we had to take off the bag packs on one section and helmet is surely adviseable! The windows add a nice touch to it. Reached the top in 3 hours.
We continued to the eastern window and went back to Vrsic on the south side. Down from the eastern window the ferrates are more challenging and much more fun. The whole trip took 7 hours.
I think a good grading of this route on the international (A-E) scale would be C. On the crux it is not so hard, as it is unconvenient because of rucksack pushing in front of you.