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@Oswald
The design is one of the most lightweight and efficient designs for clamping a saddle to a bike
Tester is using a very broad brush .. In that typical Asian made posts of this design are cheaply manufactured with a constant wall thickness – same as any design of seatpost made to a price. However, like any more expensive seat post as you pay your money more manufacturing recources are employed ie. Greater varying of wall thickness and reinforcement in the clamp area’s as the cost goes up. Take schmolke’s SL post which is one of the lightest posts manufactured and one of the more expensive posts too. That is reportedly constructed with 10 layers of carbon sheets, while the clamping sections are reinforced with up to 19 layers, but the whole assembly weighs 100 grams and conforms to all current European testing standards.
The design is more compromised with regards to fore and aft adjustment then other designs and also more sensitive to saddle clamping as Smallfurry explained, but with any component it is critical to follow the saddle manufactures recommendations for the clamping torque