Product review (4 stars): Worked with a little help
Basically worked as intended.  Magnets must line up to work.  Proper prep work is needed for it to work as intended.  I needed to adjust from top (stacked configuration) but it worked. If I didn't have the ability to see from top, it would not have worked even though I lined everything up and the magnets are strong.  Their Video was a little deceiving.  Would have given 5 stars but their shipping is expensive.  They might want to consider selling through Amazon Prime.