I use this constantly, to score everything but especially delicate things.
As a moulding/shaping tool.
But to really know you need it make the faux brads and as Maggie or Kay (apologies) demonstrated when shaping them even when I use 400gsm card the difference between the pencil tool to the Teflon multi purpose has to be done in person to truly appreciate.
I love my multi purpose but this is essential.
Please note I has another from a very well known Company that was more expensive and my children could tell the difference blind folded this is soft but strong and I don't know how to say its just better and feel able!