Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Do not buy Blu-ray. Incompatibilities between disks and players

Do not buy Blu-ray. There are incompatibilities between disks and players.The movie is ok, but the technology behind Blu-ray is unreliable. The movie stopped in the middle asking me to update the player which already had the latest firmware version. I will never buy another blue-ray.