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i weigh 85kg. no problems with it whatsoever. i thought it might creak or something but not one bit. it is really very solid
it must be mentioned that installing it has to be done correctly ie
1) work out correct angle
2) tighten the bolt within the seatpost ever so slightly, so the angle doesnt change
3) insert into frame
4) tighten seatclamp to appropriate torque
5) remove post
6) torque bolt with seatpost appropriately
http://www.aliexpress.com/item/Top-brand-full-carbon-fiber-road-bicycle-seat-post-mtb-cycling-parts-bike-seat-tube-rod/32602967543.html