Looks intresting, good quality product!
It was delivered fast (3 weeks to Slovakia). It was well packed. There are lot of spare parts (LEDs, resistors and conductors). Product fits its description. Included manual is in chinese only. Online english manual is without pictures and wasn't clear for me, but its really simple to assembly in fact. I just followed + - on the IC board and measured resistance with cheap multimeter. It took me cca 2-2.5 hours with my 6y old son.