The Clearly Perfect Angles works with any machine and it doesn't have to be removed to access a drop-in bobbin. It just rolls out of the way and goes right back into place. There are also more markings along with an alignment key right on the product. It's more user friendly than the Sew Straight and doesn't need any repositionable tabs either. In fact, Eleanor Burns used the Clearly Perfect Angle for years before now, copying the idea.