I even used it to run along the hemline to figure out what length I would need to add a binding to the hem instead of folding the hem under. Hallelujah! I'm one happy woman! Best 20 bucks I've spent on tools in a while.
I'm curious, have any of you used their Pattern drafter?
Get your own curve runner at the Curve Runner Etsy Shop. Oh! And for those who use (or prefer) metric rather than imperial, there are options for you too!