I'm 23 years old, and therefore probably not as rough with my toys as your average 5 year old, but I've had no problems with the gyroscope's build quality. This isn't a polished toy (literally) or indestructable but for a trinket I bought on a whim I'm pleased.
Explanation for scores:
Build quality:
I have used it for the past couple of weeks, admittedly less once the novelty wears off, and it has stayed in one piece- I wouldn't suggest putting it on a tight-rope over a stone floor but for most purposes the build quality is adequate. (I actually did drop it from a height of about 5 feet when messing about, granted it fell onto carpet but it still survived)
Education:
It's a fantastic example of precession and obviously gyroscopes- if you wanted to teach a child about how a gyroscope works (and subsequently many amazing things) I would recommend the toy, but I'd probably also get a
Powerball to demonstrate a spinning wheel's resistance to external forces. Then again for the money this can't really be beaten.
Fun:
Well... you spin it- that's about it really. It entertained a few friends for a few minutes- in an age of
Gears of War 3 and
Xbox 360s that's impressive for what it is.
If you're on this page, you're interested in getting a gyroscope toy- this one is small (3 inch diamter roughly) but it's cheap and does the job well enough to justify trying it before moving up to more expensive models.