I was nervous about this part of my day trip to Chamonix having heard that this cable car can be quite a roller coaster but actually it was really thrilling! It feels a lot slower than it looks from the ground and when passing the other car going the other way. It shook a little going over the brackets bit otherwise very smooth. They do try to fit as many people in as they can so I made sure to be near the front of the queue to get on so I could see the view.
The mountain itself was stunning (see my other review). I did get a little out of breath going up the few steps to the different platforms thanks to the high altitude and had a headache but it was so worth it!