Our daughter loves these. They do come apart pretty easily if bumped. They are easy to assemble.

First the good -- these were far more popular and engaging for my 4 YO than I expected. They went instantly to the #1 toy position and have remained for a couple of weeks solid. I think they are both fun and educational, also moreso than I expected. The included designs are fun to copy, and obviously it is very easy to create your own designs.

On the negative side, the pieces are sometimes very hard to fit together, and yet at other times they don't grip well, leading to collapses and frustrating failure. Basically, the tolerances in the plastic molds are not lego-grade. Overall, the assembled structures are often very unstable, so it would be better to have larger and/or heavier "base plates." The pieces are also not very clever or as entertaining as they could be. For example, the "bell" track doesn't really ring, and the spinner in the spinner track doesn't stay connected so that it falls out all the time AND it gets jammed when a lot of balls arrive together. The "switch" blocker segment is the most fun for my child, also to my surprise!

Overall, pretty good and I can recommend, but it could be better with no increase in cost to the manufacturer.

My son who is 3.5 yo loves this

Absolutely loved this set of marble run. My toddler has been asking for one ever since he saw it in a Peppa episode. Bought this one for him and it Was easy to assemble. Has kept my toddler engaged for hours , playing with the set. The connectors are very sturdy and the Marble runs smoothly.

I bought this set for extra pieces because it was so economical - bought it "used, like new" and it was only a couple dollars more than the marble run accessories where you only get a few pieces! This set wasn't really even opened so I don't know why the seller didn't just sell it as new but, I got a deal so no complaints! Fully compatible with all of the other marble run brands that we have.