I like the Pilot "Precise V5" rollerball pens, and I use them a lot, and they hardly ever leak --- except they do seem to leak with significant probability if I

I like the Pilot "Precise V5" rollerball pens, and I use them a lot, and they hardly ever leak --- except they do seem to leak with significant probability if I carry them on an airplane. Possibly that's the source of your disagreement about leaks.