Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Defective product with zero support

Camera itself has good performance, but the product quality is very poor.After less than 12 months of fairly low use, the camera developed "memory card errors" rendering it unusable.Canon service was near zero, refused warranty coverage and charged $150 for repair.They changed a "defective" CF unit to fix the problem.Without telling me they also upgraded the firmware. This "upgrade" makes the CF cards unreadable from a regular card reader connected to a computer.In short: lousy product quality, dishonest communication and appalling support.