The things they can do with Legos these days. WOW! Now, this was purchased for my 6 year-old, even though it says 9 on the box. So, he tried for a little bit to do it, but needed my help. It is probably the coolest Lego set I've built to date! There are gears and belts and all pistons and drive shaft and all sorts of things in this little mining truck. It was pretty amazing when it was all finished. I did have a minor problem in that two teensy key pieces were missing, but i just dug through our Lego stash and found a couple that would work.VERY fun project!Really enjoyed building this with my son, showing him the moving parts and how things go together. And it's a little sturdy truck as well, holds up to play for sure. Nice all around. We did switch over to the bulldozer and notice quite a few extra parts. Need to keep them separated from the herd of parts. Otherwise, good sturdy build that holds up to play.Bought this as a gift for my husband to put together on Christmas. I liked that it wasn't a ton of pieces, but still made a nice, complex looking end product. My husband was able to put it together fairly quickly, which was what I wanted, and yet it still provided him enough of a challenge that truly enjoyed the process. Don't take super long to put together, but just long enough that he didn't lose interest!Grandson really likes it. It came missing a part but they are working to get it from Lego. Really cool looking.My 11-year-old modified the final design when the steering didn't work as planned... but he loves it!10 yr old grandson loved it. Can't go wrong with LegosIt is amazing !I am from China . I wait a long time but it is worth. there is one point that after I received the car ,it doesn't ship to China now and the other Lego also doesn't .why ? Chinese market is big and the decision isn't cleverVery much enjoyed assembling this kit. Occasional confusion with picture directions but totally engaged me for a couple of hours and wound up with a cool display vehicle. Great value for the money, highly recommend this Leggo kit!I am 39 years old and have recently rekindled my love of lego from childhood after buying some Christmas lego gifts for my 7 year old. This was my 1st technic purchase and all I could say as I was building it was "wow this thing is cool." I wish they made this kind of stuff 30 years ago.The quality and design of the tiny parts are incredible. Working gears, drivetrain, piston, belt and steering....awesome toy!!! Also a great piece for teaching youngsters about machine parts.Worth every penny...I can't wait to get more of this stuff!Great set. Challenging for a six year old. He needed minor help to put it together. Excellent introduction to how various gears work (worm gear, bevel gear). Well worth the money.GoodGave it as a gift. They loved it.It's to see the smile in their face, there's no price for it.