Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Beware the rebate!

The drive is a competent but not speedy performer on the firewire side using a PC. Benchmark performance on Sandra was 15% - 20% off optimal. I have not used the USB interface. ACOMDATA failed to pay out its rebate offer despite three phone calls and a letter to corporate. I gave up at that point. They won't get by business again.