My kids love Mario, and we were all excited to see the Mario cars and tracks. With Christmas coming up we started with these karts. Glad we did. They are put together easily, look nice, but fall apart oh so easily. Just about every 30 seconds I'm handed one torn apart being told to fix it. The characters don't stay on well, their hands and heads fall off, and the back wheel assembly falls off from the middle - it literally breaks in half easily. I'll be watching reviews on the other knex Mario products before I put any more money into this line of toys. As I wrote this I had to fix them 5 times!
We are a family with two boys and own all sorts of tracks. We own Geotrax, Hot Wheels, Darda, and Thomas the train. Those are all great systems. This one is NOT. The track is made of soft and flexible plastic and the track pieces do not actually lock into each other. As a result, any jarring or adjustment knocks these flimsy things apart. The only redeeming quality of the set are the vehicles thus my two stars. My kids love the cars and have given up on the track and just race the cars on the floor. The cars are very peppy. I bought this set along with the expansion pack to give my kids more options when creating a track. The expansion set is useless unless you buy all the other accessory track sets. It does not contain enough straight track to create new track designs. We tried every permutation and could only incorporate 4 or 5 expansion pieces into our track...which keeps falling apart anyway.