The most difficult part was to register for the race, as the website went down a couple of times when they started the selling bibs (bib-only). I decided to register for the half in August and it wasn't sold out (race is in September). You need a medical certificate just like in Italy, I used my Italian certificate for athletics in competition and provided a translated copy (italian to french).
I went to the expo as soon as I got off the plane and it was super easy to get around and pick-up all the things you need for the race. There's an information counter where you can ask help if needed.
Corrals were big. Too many people, but it worked-out well as they were releasing people in small waves as the streets are not big enough for everyone. If you want to run fast, it was almost impossible to do so as everyone is there for the experience and not the time. I think cut-off time for the first corral was around 1h30.
I only did 1 stop for character pictures and the line was moving fast. Water stops were amazing, you could find water, gatorade and different things to eat. It was my very first half so I didn't know I was going to be so hungry at km 15, I really appreciated the snacks!
The finish line was a bit crowded but considering the amount of people running everything was very well organized.