Instruct: Classify Amazon reviews into positive or negative sentiment
Query: High Hopes then Disappointment

We were very excited to assemble and play w/this classic toy; Our 6 year-old-son has discovered Nascar. Unfortunately, the guard rails did not stay on and the pieces did not snap together easily.Once assembled one track worked very well - the car went so fast it flew off the track ! The other track worked inconsistently then not at all.If this toy did work it would be great fun !