Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great fun (and educational, too)!

I bought this marble run for classroom use, but I enjoy using it myself. I'm working on my teacher's certification and bought this as an activity for a unit I designed on the six simple machines. I think it's a wonderful hands-on way for students to learn about inclines and such. Truth be told, I'm infatuated with it. The colors are very eye-catching and it's great fun to work with. I can't wait to use it in the classroom. Another reviewer suggested buying two sets, which is a good idea. If you know a child who likes building toys (blocks, Legos, etc.), get them this marble run. I loved that stuff as a child (still do) and I truly enjoy this marble run.