I had one. It slipped quite a bit. The two halves not staying together, meaning saddle was nose up or down. Happened every now and then. Wasn't too light and I didn't notice any comfort improvements whatsoever. But it looked cool so thumbs up from me
I've had two. They do tend to slip. You just need to tighten the seat tube bolt really tight and it will hold. Being Carbon it is nerve ranking business. Changing to a different type of clamp helped a lot. With the new one I can now adjust quick release tension with allen key.
Any one got a link to a vcls carbon copy aliexpress look like they have cleaned up.
And any reviews? Are they any good