"Quite a challenging build. I was not expecting it to be so massive. The instruction booklet was very informative about wind power and the steps Lego is taken. The only downside to this set is it takes 6 AA batteries and the airplane beacon lights on top of the wind turbine don't flash, blink or light up in any way which would be cool. I would have liked to see it make its own electricity but realize it can't. Also, the price is definitely up there but it's worth the price."