The method is a good one, and once you know it you can build several similar props with it, as the
DVD acknowledges. As with most things in magic, it takes practice to get it just right.
I've read reviews that say it is cheaply made and unreliable. Mine is well-made and holds up
well.
As for the effect, it's of limited utility, but it's a good and more modern
substitute for the old milk pitcher effect.
Overall I give it 4 stars.