They can be fun for kids and adults who enjoy surprises and opening something new each day in December. The mystery component builds excitement and anticipation.

The boxes allow you to customize and personalize an advent calendar, filling it with small gifts, candy, notes, etc. This allows creativity and personalization.

However, some people may prefer to know what they're getting each day rather than having it be a blind surprise. The mystery boxes require more effort to fill vs. pre-made calendars.

The blank boxes could lead to some days being disappointing if the gifts inside aren't well thought out or are low-effort. So it requires planning to make each day special.

These mystery box calendars work best when you put thought into making every gift unique and tailor them to the recipient's interests. Filling with random trinkets may not elicit as much excitement.

They can be a fun project for crafty people or groups/families to collaborate on and fill the boxes together. The blank slate allows room for creativity.

Overall, the luxury mystery advent calendars allow fun surprises but require effort to execute well. They work best when personalized and filled thoughtfully for the recipient.