NBD Corp Future Balisong Small Super Car with 1177 Interlocking legoPieces, for Genuis Kids

Absolutely worth every penny but extremely high difficulty level. This set does not hold your hand. The manual expects you to understand many advanced techniques already used on many Lego technics sets. You really have to pay attention to every little detail in the colorful manual to get it right. The only issue I had was the wheels are different than this Amazon listing shows but with minor mods that are included everything works great. The doors are very tough to build but work out in the end. Xingbao has my vote and they pay the designers for using their designs and include their profile in the manual. Amazing box design too. Blows away other companies.