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Get the Composit, seriously.
If your downstairs neighbour is complaining, you'll still notice that with the Cambium, it's a great comfortable saddle, but still too much pressure (and it's quite spongy).
The Composit is flexy in the middle, whether the carbon have zero flex whatsoever, if you do get on well with the carbon, then your neighbour will most definitely enjoyed their new resident of the Composit.
BTW is your the real or fake carbon? if former, gimmie.
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I dont profess to be any kind of expert and have tried all of the above, on my commute, so no long 100km+ journeys.
C15 just didn't work and I think the top is too curved for me (others on here love it) and too narrow. Not sure about the C17 as I tried a short one and it was Ok but it not exactly butter on my butt.
The SMP does feel more comfortable and I think the reason is that once you are on your sitbones, everything else feels less pressured so you don't notice it as much. I also find that I can move around on it enough not to be uncomfortable and for short journey's is OK in just my mtb baggies.
I also had a forma before (the dynamic shape but no padding so similar to your carbon) - and that was uncomfortable for the first 5 mins then much better. At the moment the dynamic is nice to sit on, but I am still messing with my bike fit, so ask me once I get an inline post.
Okay, I have to accept that my Regale is doing me no favours in the downstairs department, which is a shame, because it works fairly nicely for my sitbones.
My ali-special carbon SMP is the right shape, but too hard for longer rides. Thinking of trialling a Cambium - can anyone (@edscoble ?) who's ridden both give me an inkling of how they compare to something like a Composit? Cutout vs none, C17 vs C15, etc.