This was fun build even do the instructions are not so clear ...
923817
This was fun build even do the instructions are not so clear when you are putting it together. Things that I will change of this product is the lenses are to close in my opinion, they are hard to look on. Love the magnetic  button is so easy to press thing when you are in google cardboard app another thing is the strap love that you can put it on the outside to yeah my head is big. Still don't find the necessity of having the rubber band. For the price is a really great product and does what it needs to do. I have test a few games in it including a few oculus rift ones (yes you can play some of those games if you have the correct apps for your computer and your cellphone) was amazing so if you ask me to recommend yes I will.
3157861
So much fun building it up...At first it seems very complicated, but then you get a bit more familiar with it and build it quicker. Once finish, watch the car running on the track is very delightful...the only con is that the connectors tend to loose after re-build.
4327930
I bought this at the big box store. My son is 4 so clearly I bought it so I could build it and he could play with it. It took me about an hour to build and it was easy. It works perfectly, no snags, no parts falling off. I only gave it 4 stars because once it's built, there's not much to do but watch it. So pretty soon I'll have to use my engineering skills and figure out another configuration. Also, the directions are a little tough to interpret, needs more blown up details.
4943758
The directions wasn't clear at all however this will work.
2251795
Purchased this for my six year old son who loves these sorts of mechanical toys.  The kit is rated for ages 9+ and is certainly warranted.  I had to help quite a bit in the build. Part of that owes to the very complex directions that are hard for even an adult to decipher at times.

Plan to take several hours building this set.  But thats really part of the fun for my son and me.  The box advertises two different coasters can be built from this set.  First problem, they don't actually provide two different sets of instructions.  Instead you must go to their website and download the additional directions. The build sheets are all in color and many pages so make sure you have plenty of paper and toner before you start printing.  Problem two, K'nex now requires registration for thier "club" to access incremental build instructions.  Third problem, their website hasn't caught up with their sales cycle because once I went through the hassle of registering they only had two different builds available - for a kit we didn't buy.  Considering they sell nine different coaster kits, to have only one additional build available online is quite misleading to the point of being fraudulent.

We've been very disappointed with the K'nex blocks lately so I was very skeptical as we were nearing completion of the coaster that it would be sturdy enough to run as advertised.  But I have to say I was pleasantly surprised and my son was delighted.  The coaster is fun to play with and watch for a long time.  It's an impressive three feet seven inches tall which is not lost on a six year old.

The motor that pulls the chain runs on 2xAA batteries (of course not included).  Two odd things here.  First it took me several minutes to figure out how to insert the batteries so that I had the right polarity.  It really shouldn't be that hard.  Secondly, once the coaster is built the motor is in an odd position and would require you to disassemble a portion of the coaster to change the batteries.  This last bit shouldn't really be an issue as you are likely to tear down and rebuild the kit a couple of times before needing a fresh set of batteries.

The kit provides ample teaching opportunities for the physical sciences to even a six year old.
He is begging to build the other coaster now, so I have to figure out how to do that from just a picture w/o directions.  Overall we are very pleased with this set.  It has helped somewhat to redeem K'nex in our eyes.  The last several set of blocks we've purchased have been terrible.  This is a step in the right direction.

Pros:
Fun to build
Impressive size
Fun to watch once completed

Cons:
Instructions can cause frustration
Misleading marketing
Odd battery arrangement
3623944
I was a little diffcult to put together the instructions were not as clear as I preferred. I had to unscrew and screw different parts a couple of times but eventually I got it. If anything goes wrong beyond this I will update my review but as of now it's great for the price
284484
We recently finished building this. It did take 6-8 hours and we had a few mistakes we had to correct but it was fun and our son (age 11) is very proud of what he accomplished. Just take your time and you will have success on this project.
1585190
My 8 year old loves to build and thought this would be great.  He doesn't like it - I think it's because the instructions aren't as clear as they should be.
4288996
My daughter enjoyed putting this together. However, be prepared to help. After build a set and playing with it for a while, the pieces end up in a large lego bin where they are transformed into anything the kids can dream up. I added a photo of a structure we built with pieces from the Dream Cruiser.

The sets are really fun and good practice for following directions, but when the fun is over just let them build.
3327724
Fun to build but lacks instructions. Some parts you quess where they go...look up the actual ww2 images to get a better idea of paint schemes.
1159105
I had a fun time putting this together. However, I will say that some of the pieces aren't backed up enough on their own and will fall off.. I don't ever plan on taking this apart so I used some super glue to help. My kit also had a handful of small critical pieces missing, which I had to request a replacement through the Lego website. It is a free replacement for them to mail the missing pieces, however my time explorations are on hault until I get them so I can complete my time machine. I wish the instructions were a little more clear in some areas. I found out that while building a portion of the back half of the car, that a few pieces didn't line up as they stated it would in the photo instructions. Not a big issue, i'm just going to have super glue be my trusted sidekick.

I would say if you are wanting to actually PLAY with this, to use superglue.. or be expecting of pieces to fall off since they aren't held on that well.
91419
this is a alot of fun i would expect it to have a bit more clearer instruction and a bit more mechanical
3129437
This product was a lot of fun once it was put together, but it required parental assistance to do so. Unless the child has a lot of patience and enjoys building this will be a parent project for the child to enjoy later.
3595501
Son thinks that this is pretty cool, but the instructions were hard to follow. It does a top-down diagram of the design, and tells you what pieces you need in each step. Unfortunately, it shades all the pieces really lightly in the really-too-small pictures, so its sometimes hard to tell where all the pieces go. He's having more fun just building his own designs.
1798095
It took five people to figure out how to open the battery placement of this RC forklift. The instructions are not very clear as the diagram did not agree with the product. Once we got batteries installed it was fun to play with. My business used this as a ddemonstration on forklift use for our annual safey day training. It was a big hit, but I may say the instructions are poorly written.
4944799
We got it for our 10yr old for Christmas this year and he likes it very much.  He's really into leggos and although it's not a leggo product you can use some leggo figures etc. with it.  He is very talented with putting this kind of thing together so it only took him 2-3 hours to complete the entire project.  Now we will be challenging him to deconstruct it and make it over in different forms.  Hopefully that will be as much fun as the original build.

I was a bit disappointed that there were not more cardboard "glass window panels".  The bare areas in the photo is the way the finished product will look.  I somehow thought the windows would cover the entire thing.  They don't.  I don't know if you can get extra pieces or not.  But maybe it's not important?
1493804
I'm impressed with how clever this is.  You can choose to make four different models and it appears there are enough pieces to make two at the same time.

These are complicated and the picture directions aren't always clear so you may have a hard time if you're a Lego newbie.  But now, after making them with help a few times, my four year old can make them all by himself.