Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: 8600 is a defective design

I have had 2 8600 scanners fail with the same problem. The scanner will stop scanning because it detects the lock is locked eventhough the lock is disabled. Visioneer replaced my first scanner and the replacement failed 9 months later with the same issue. They then would not back up their product.I recommend buying elsewhere.