This class was worth it just for the set of interfacing swatches that come with the class. Sarah's info and experience is valuable to someone like me who never gave much thought to interfacings and had no idea there were so many types to choose from. Are you the type of person who likes to do things the right way? Do you actually change needles and thread according to the type of fabric you are using? Do you have every presser foot out there because you want to get the best results? If you are this kind of seamstress you will love this class.