Instruct: Classify Amazon reviews into positive or negative sentiment
Query: McKinley Explorer Set

I have been running this train for 2 years now and I'm very pleased. Dollar for dollar, I think its worth it. This train set is not for kids, but only because of the couplers. The couplers are not very good and break very easy. Fortunately, there are better couplers available for conversion. I had to add weights to the passenger cars to keep them from falling of the track, but the engine just keeps on running. I have 7 other brands of engines and this little engine out runs them all. Most people don't like them because you can't convert them to DCC, at least not very easily. I let my 7-year-old grandson run this train (after I couple them) and he runs them pretty hard. He constantly throws the reversing switch without stopping the engine first, which is a very bad thing, but its still running.