Pros: +Excellent time waster
+Brain trainer
+Good looking
+Extremely entertaining user manual
+Makes you feel intelligent when you finally succeed in the assembling process (if you do)

Cons: -Excellent time waster, far more than you can imagine just to build the thing...
-Awful user manual...there's NOTHING but some of the pictures that are useful...which of course is entertaining but still awful
-The construction quality is unstable, plastic and makes you wonder with every piece you put together if that piece REALLY is supposed to go there.
-Just to put the small bits together took hours because of strongly varying fit.
-When you're done you'll think that you've accomplished something, when you simply haven't. :)

Other Thoughts: Simple toy that takes a long while to build.
I like the build part a lot, since it's almost like a puzzle or a riddle if you use the manual manual.
As far as if it's worth the money...I would say yes.
The toy should be sold with readycut railing, just to calm you down when you've opened the box.
Maybe even with all the arms/holders/shafts put together, so you don't lose your mind after the almost slave-like work you put in to that bit.

Bottomline: Awesome time waste.
Whether or not that time waste is any good is up to you.
But you have to face the fact that it won't be a complete toy to play and watch until hours/days/weeks after you've opened the box. (Time depends on patience)

Pros: - Great toy and gift
- Really fun (after ready)
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Cons: - Bad manual... really hard to understand
- You get just one big piece of the rail, and you have to cut it into smaller pieces (guessing the lenght)
- The metal sticks seens to be loose on the base... making kind a hard to mount on the fist place
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Other Thoughts: They should sell spare parts so you could try bigger trails
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Bottomline: Just buy one and try :)
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Pros: grat little toy
you could have hours of fun watching
the ball going round the track
easy to use instructions(if you look at the pictures)

Cons: instructions in engrish not very clear
not the best build quality plastic feels quite brittle
a nightmare to put together without
the instructions
the elevator seemed to use the batterys up very quickly even when using high quality batteries

Other Thoughts: buy one for your friends and remove the instructions
the will love you for it

Bottomline: buy one they are great