Just transfer all of the amazing presser feet from your current collection to the new stunning box, watch the tutorials and peruse the lovely booklet at your leisure. You will get the full Madam Sew Ultimate Presser Foot experience for a fraction of the full set price.
Most slots in the Madam Sew Upgrade Box are for the same feet as the ones in the set you may have purchased elsewhere. A few might be different though and the bonus adapter is a unique feature to this set. (You can order the bonus Low Shank Snap-On Adapter separately but most likely don’t need it as you have been using your feet without issue. Just leave that slot open.)
For your feet that are different, use one of the slots you aren’t using in this upgrade box. Just make a note of what foot you have there so you can find it easily when you are looking for it.