X-mas is coming! Last year I bought a couple, and was impressed by the mechanical and electronic design, but we couldn't make them work very well, we tried a lot of variations, including reading the instructions ;-). We even used tiny bits of plastercine to fine tune the balance and we extended some fins.
Betcha some of the guys in this group have tried out these little units, so I'm wondering if u have a specific recommended model for newbies. Ken