I went from a near impulse buy on amazon to finding the real deal on here and it was absolutely worth it. The 16 magnets (vs. 8) makes ALL the difference.
I've been looking for some additional coping tricks to distract myself from biting my nails while watching TV or at the computer. These things are exactly what I was looking for. They've got the right mix of challenge, variety and continuous motion.
I very rarely leave product reviews, but I felt compelled this time.