Advantagesharder to lose than a marker pen
Disadvantageshave to squeeze firmly to clearly mark letters
AdvantagesExtensive range for men and women, high quality, can be up-graded
DisadvantagesExpensive - both to buy and insure
AdvantagesIt's easy to use, comfortable to hold and a well-designed product.
DisadvantagesCorrect pressure has to be applied to trigger for best outcome.