I ride with an Origin 8 CF seat post on my Surly LHT. Does it cushion the ride? Who knows? I tend to stand when I got over big bumps anyway (RR tracks, uplifted concrete & asphalt road joints, etc.) but on straight pavement, it rides quite smoothly. There are horror stories about them failing without warning (as Stapfam warns) and there are definite arguments over proper installation (greased or not greased).

Occasionally I think about it cracking and ramming the end somewhere not intended to accept such intrusions but mostly I just ride it and like it. At this point I can't even remember why I had my LBS install it on the new bike: for weight? for road bump absorption?