LEGO Technic Liebherr R 9800 Excavator 42100 Building Kit (4,108 Pieces)

About the experienceits a massive set - so it will take time , but it is a really pleasent experience, hats off to the designers to make the whole process a seamless routine. Great details overall, the special parts for this assembly seemed to be really nicely made, nothing too small. 4000+ pieces is a challenge in itself - but everything is arranged and sorted neatly to follow the steps for the build.Once built and setup the movements are really precise- precise in terms of a LEGO set. And the assembly does seem to be really sturdyMoement of the caterpillar tracksis limited to few surfaces , but it works well on flat areas.its a great build for hobbiest's, or for young adults, I wouldnt recomment kids to work on it by themeselves as it requires quite a bit of patience.Drawbackthe app is a bit irritating at first to use, it doesnt seem refined to work on a touch screen device.The whole machine does require 12AA batteries- I really wish LEGO would just provide a rechargeable setup for this build.Shippingi got this shipped to India through Amazon.com- really fast convenient from the seller to ship it .but yes there will be a lot of delay at customs and usually they will open up the box to check the contents for "security purposes"- it is a risk but not much of a choice on that front.

FIRST REVIEW (3/24/21) I am starting this review after completing the first 2 (that's right 2) bags and man it is huge. So far so good and it is good that you can test it as you go with the app. My usual complaints remain however. The instruction are vague and well suck. The print on the pages is hard to make out so counting holes is really hard and with this monster you have to be right all the time. Some of the instructions must be in the designer's imagination and are difficult to perform. They just seem to stop thinking when they make them. Overall, I like it but worth the price? I'll get back to you.SECOND REVIEW(3/29/21) Finished it the other day. I have to say I am amazed that everything worked as stated the first time. Being able to test the design as you build is a HUGE plus. I am finally able to use it to its fullest extent. Forward, reverse, left/right turn in both directions good. If I have one suggestion they need to improve the tractor system it is not as smooth as it should be but acceptable. Rotation is dead on. Operating the arm and bucket are also very good. The multiple ways to control it is also a HUGE plus. Thus, I raise it to 5 STARS. I am also getting the Volvo hauler as a companion. CHEERS!

OMG! Best LEGO set ever. Yes, it’s expensive but it’s worth it. The build process was awesome, not repetitive at all like others can be. Pictures can’t do the size justice. The app works great and it’s super customizable. If you love large scale LEGO sets pick this one up before the price skyrockets.

Very nice set really big and its detailed. The only this I would wish for it that the instructions tell you to test the model when done building a module, however they dont tell you that you need to have all motors hooked up and in the right spot on the motor controllers to work right. Maybe update the app to let you test motor controller separately and a way to tell you what motors are hooked up where and if it's wrong. Also "AA" batteries??? 12 of them at least have the option of lithium batteries you get better power out of them and wont be sending so many batteries into the landfill because the battery trys are removable I would like to see some alternative battery setup in the future

I love this set, it was fun to build but left some sore thumbs with the little colored pins and the number of ones needed for this set. The "replayability" of the Control+ app make the model that much more fun to play with and get it to move round or pose it for display. FYI this requires 12X AA batteries for the 2 control boxes, which take 6X each, which are needed to have power through various build steps to function test the power functions and movement of assemblies. SO make sure to have those on hand when building this!

This item showed up in pretty amazing box condition considering how far the item had to travel to get to me. It was packed well and it showed up today 6/20/23 instead of 7/5/23, which totally surprised me. You have to be patient with this vendor, but the item does show up as expected. Plenty of tape used. Plenty of labels on the box to make sure it was not drop kicked and abused during transit.

While it does take many hours to build, this is a great kit for adult Lego builders. Large detailed manuals walk you through the construction. Multiple motors provide complete control of all movements. Connected to the phone software, this becomes a true radio controlled vehicle. I too the time to disassemble, using the manual in reverse order, and plenty of gallon size zip lock bags, so that I can rebuild it in the future (or let my grandson do it when he gets older).

My third Technic and what fun they are to build! The engineers who design these Technic toys are incredibly smart. Instructions are well written but you must pay careful attention to every detail when building as missing one note may cause you to disassemble in order to correct the mistake. Luckily all the parts simply snap together so disassembling is not a big deal. The motors (5) and controllers (2) are all state of the art and work intuitively & flawlessly from an app on your phone.