A companion purchased a box of these on the basis that she liked many of Bic's pens and widely used them. Not only do they not write on many CD/DVDs at all, but having not used the one that was in use for a few weeks, it was found to be dry and useless. Removing another from the box, it too was dry and the same was true of all the remaining ones, none of which had previously been touched. The caps were tightly in place yet they were now quite useless.
Although inexpensive, they are poor value if they either do not work or have a very limited storage life that may be counted in days or weeks rather than months or years.
As at least one other reviewer has made a similar claim, unless the stocks were simultaneously purchased from a batch of poor quality, I would suggest that these are best avoided, especially when there are better available alternatives.