I actually have 2 of them. One for the house and one in the car for trips to stores. I use many of the functions. I like that it factors in seam allowances, extra yardage for backing that gets drawn up in quilting, how many strips and yardage for bindings, borders. Guess Im just lazy and not good at math, but I really like it. Comes with a DVD to show how to use all the functions. And I use it for just a regular calculator!