Product review (5 stars): Easy to use and the spinning action is more than just a gimmick
My 7-year old and his friend had a lot of fun with this toy.  The cubes, when pushed down, tend to stay in place, though like any perler bead, they will pop out of place if bumped.  I was surprised that they didn't fly all over the place when spinning, but actually held in place.

The spinner is actually quite well designed.  The trays are easy to pop in and out, and the lid ensures they can't fly out of place while spinning.  Also, it collects the excess water in a small removable tray.  I thought the spinning would be just a gimmick, but it actually does help evenly distribute the water to ensure all the cubes stick to each other.

It comes with 4 different templates, two trays, and some accessories for the finished templates.  As for the cubes, you get enough to do each template only once with no duplicates.  Therefore, I'd recommend buying a refill pack.  Also, the cube storage tray is just really thin clear plastic, with no lid, so keeping them stored will be an issue and you might want a small container with compartments and a lid.