Pros : Good marker for very thin lines.
Cons : It can be messy, once in a while there is a blob of silver paint on your glass or paper.
Other Thoughts : If you need to get rid of the silver marking then depending on the type of glass it can be very easy especially when the silver paint is still fresh, other times it can be hard work. Sometimes just rubbing it off with wet cloth is enough, but other times the only trick is to use a pencil eraser and then all purpose cleaner.