Advantages: good hand-held, not too heavy it is all aluminum, a ballpoint pen that writes well, a carbon dome to touch that slides better than a basic stylus.
The cap fits comfortably on both sides thanks to the presence on either side of a recessed O-ring!
Replacement part: Replacement tips for ACK20610 Bamboo Stylus solo & duo 3rd Generation = about 5 Euros a pack of two (...)
Defects: we could lose the cap, a click system with retractable mine could be better. It is not stated in the doc features of the pen mine that are 67 mm long and 2 mm in diameter search criterion short ballpoint pen mine there on Amazon.com about 7 Euros pack Six. This lack in the literature is a star under my assessment.