It worked okay with the candy molds I pulled out of the advent calendars, after Christmas (though I overfilled most of the spots I tried). I sprayed the mold ahead of time with a non-stick cooking spray, and the candy came right out. I'm not entirely sure the spray was necessary.
I also tried dripping a few hearts off of a spoon. It worked best to make the outline of the heart first, and then fill it in. I was going to add sucker sticks, but the candy hardened faster than I expected, and I missed the window.
As to the candy itself, be sure not to add too much corn syrup, and stir it really well, or the candy will be gooey, and grainy.
And, I would suggest doubling, or even tripling the amount of flavoring called for in the recipe.
Also, if children are going to help out, be extra careful when removing the bowl from the microwave, it gets very hot, as does the melted candy.
It's great to be a homeschooler.