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I have one of these on the road bike. Doesn't inspire a lot of confidence with the carbon cradle but it's crazy light and so far it's still holding the saddle with no creaks. Clamping system it's a lot better than the new ones with the round thing pressing in laterally, easy to adjust and never moves.
Comfort wise I always felt like my alloy road bike was less jarring than the alloy fixed. All else being similar I guess it was the sloping frame with a massive carbon post Vs traditional with a stiff Thomson. Don't think it will make much for people running short posts.
none of them are good IME; get thomson