Instruct: Classify the given Amazon review as either positive or negative.
Query: cheap materials, shoddy design durability

The kit was easy enough to install, though I cringed when comparing these lightweight plastic components to my worn-out but heavy duty American Standard parts. After a few months, the fill valve water level sensor started sticking -- so the tank wouldn't refill -- I had to open the tank and tap so it would drop to the water level. Then the flapper started getting stuck in the open position. Tonight, the whole damn valve failed, and my bathroom had an inch of water in the few minutes it took to turn the water shutoff.