Review Title: Deception

I bought this pen with moderate expectations, but the user experience is unacceptable.
Material: The pen body feels dusty and "cheap" to the touch. It is uncomfortable for prolonged use.
Size: The dimensions are completely disproportionate. It is too short for an adult-sized hand, which causes rapid muscle fatigue, and the diameter is so thin that it is difficult to maintain a stable grip.
Button (Mechanism): The click button is the worst component. It constantly sticks, requiring several attempts to expose the tip. In addition, it makes a metallic noise and it seems like the internal spring is about to break at any moment.
Overall Performance: A pen should be a functional tool, but this one fails in all ergonomic and construction aspects.