I have used both the ryet full carbon saddle and the plastic base one. All have held up very well, and have continued to buy them. In one instance I ran it with an elita one seatpost that just used the turned metal rail clamp. After it slipped a couple of times I over torqued it, and it worked fine for a year but I compromised the carbon rails (user error/less than ideal design). The saddle eventually failed while bunny hopping and landing hard on the saddle. For cx/mtb, I err on the steel rail version.