I have and have had many seat posts over the years. Infinitely adjustable posts are my preference as I can get saddle tilt exactly perfect. Currently have two of the Nitto single bolt posts and they do require a lot of torque to secure the clamp. The Campy C Record is excellent as well with the bonus of not requiring as much torque to secure the clamp as the Nitto. Once had a cheap Asian carbon post that served well for about 8 years until the clamp fractured. The clamp was aluminum and it simply cracked from the load I put on it.
My personal favorites are an equal toss up between the Nitto, C Record, Velo Orange Gran Cru, and the good ol' Nuovo Record two bolt post. All three seem exceptionally durable, have at least 25mm of setback with the Gran Cru at 30mm, and they all look great. Weight? Light, strong, inexpensive. Which two do you want?