I have yet to use the pen, but the tube that housed the rollerball/ballpoint adapter was FAR too small for the piece.
I tried various methods of trying to extract the standard pen tip to no avail. In my efforts I ended up scratching the interior of the standard pen tip. I had to resolve to cracking and breaking open the tube with pliers.
Even when I exposed half of the tip and tried to pull the tip out it wouldn't budge at all. I, then again, slightly scratched the threads. I wasn't able to retrieve the standard pen tip until fully destroying the plastic tubing. Nearly cutting myself.
This size problem renders the tube useless. I now have nothing to store the fountain tip in, and negatively affected the standard tip in the process. Extremely poor design for such an expensive pen.
Expected more. Expected better.