I really like the clever design of this product. the screw thread makes for a fascinating parade of ferrofluid spikes. I feel kind of picky when I point out that the glass bottle is optically quite poor. It looks like an ordinary food quality container. I would be much happier with the little gadget if it cost 50$ more and had a higher quality container.
The way the ferrofluid moves is amazing! Very mesmerizing.
Gave this as a gift, been told it's incredible.