"The sets in this space theme are stellar. I couldn't buy all of them, so I had to pick the best ones, including this set. The transport with treads is a clever mashup of the NASA crawler and Russia's horizontal transport train that tilts the rocket into position at the launch pad. We also get a nice control room, a fully decked rover "clean room", and a little truck. All the play features (there are a bunch) make for hours of fun. The octagonal pieces between each section make for easy connections with the rocket/space station modules in the other space sets. There's so much play potential here!! The only negative aspect I encountered is the rover lift in the clean room. It moves smoothly but doesn't stay in a convenient, stable position. Aside from that, this set is awesome!"