I've been to 2 out of the 3 stores in Paris. The Boulevard Raspail store is fairly small and wasn't very busy when I went to it. I think there was only one employee at the time, but luckily she spoke English. She helped me try on a few pair of shoes and wasn't pushy or anything (I ended up not buying anything). There were some great models I haven't seen before including some great green suede loafers.
I also went to Le Bon Marché, which is a department store in Paris that carries a lot of expensive clothing. There were a lot of salesmen on the floor and I got intimidated, so I didn't really interact with the shoes (I also don't speak French, so I wasn't prepared to engage with any of them).