These clear spots don't seem like they should be able to hold up very much weight, but I've got a large comb pressed on one on the message center by my front door to remind my teens to comb their hair before leaving the house.
The dots are very sticky! It's completely respositionable, but like any repositionable adhesive if you move it too much the oils on your fingers or any dust can mess up the adhesion. But the dots are sticky enough to stick very well to different types of surfaces.
Also, because they are clear the work well to hang things in windows. That may wind up being my favorite use for these. Using them with laminated pages makes for quick decorations for holidays.
Full disclosure- I received some of these for review purposes. This is my honest opinion and my experiences with the product.