Pros : Handy addition to the tool box. Useful when marking glass to be cut on water cooled saw as outline is not washed away during the process. By scribe shape and rubbing paint pen across scratch and wiping of excess this leaves a good outline for cutting. Also found useful for small patterns.
Cons : On delivery found that I had some difficulty reversing the tip. This is an issue that is easily remedied and is not an ongoing problem.
Other Thoughts : Certainly worth the price for this handy tool.