These are light, fit securely, and are easy to switch from dual to mono. I haven't owned another pair of crampons, so I am not sure I can make a fair comparison, but these have been great to me.Mine came without the mono spacers. I called Grivel and they sent them to me for free, along with a sweet sticker. I <3 good customer service. Just bumped my review to five stars.I tried to fit these to my GF's size 5 boots and the extension bar ran into the rear points of the crampon. I had to file them down. When I bought a pair specifically for her boots, they had already been cut down substantially in a similar fashion, so it was not a problem specific to my pair; they just aren't made for tiny boots right out of the box.