Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Not great.

We were not pleased with this. We have a marble run we can't find any more, so we were hoping this one would be as good if not better. It was very difficult to put together for the adults, let alone the kids. The pieces are different lengths so it is hard to get everything to line up. The spiral pieces are held together with little plastic clips and were very flimsy. The pieces don't just fit together, there are a lot of little connector pieces you have to stick in between each piece. We also found the pieces didn't fit together tightly. We were so disappointed with it we packed it up and sent it back.