My dopey Porsche Pen all carbon stopped working 3 months after I got mine from Porsche. Thank G the car lasted a lot longer before I sold it.We got a Porsche pen too with our vehicle purchase. Thought it was great till I looked it up and found out it was just a regular pen with Porsche logo. With the Lotus one I swapped out the ink cartridge with a Parker Gel and it writes and feels awesome. I like it better than some of my $200 plus actual Parkers.