Personally, to keep it consistent with other crags in the area (notably Montagne d'Argent), I'd put this one more in the 5.6 to 5.7 range because of the moves at the top to traverse into the left leaning crack. Didnt' feel like 5.5 to me.
Hi Mike you have a point keeping the consistency with M$ but i also find it deceiving when i travel around and find that it is just good for the ego and not the real difficulty.This is also why people love high rated easier stuff. I have put 5.5 because it felt easier than a lot of 5.5s i have been on and also climbed it with approach shoes....i'm far from a 5.12 climber!!!! I have learned that the people that bolted the route are going to put a 5.7 tag on it when the guide gets published so i will then adjust it here. MP is great for that matter because you can enter your own feeling of the climb! Hope you enjoyed Gervais!