I love them, and have several pairs in different styles and colours. They are my main footwear for work. I like the Gizeh (toe post) style best, but also have Arizona and Madrid, plus a couple of pairs of footbed sandals from Next, which I also find very comfy - although the footbed is not as highly profiled as the Birkenstock one. Personally, I've never had to break mine in, but they do soften up and get even more comfy after a few wears. My only problem with them is that they usually end up stinking long before they wear out, and I end up chucking them away because of that.