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Title: Premature Failure --> Unreliable Tracking
Review: During the last year I have had 3 to these trackballs. All three of them prematurely failed in operation. The first lasted almost 6 months, but the second lasted all of 2 weeks and the third 32 days before they failed to move the cursor. They first got to the point they would only move the Cursor when in an upside down or on their side position, then they failed completely. Great Ergo dynamics but that is only good if they are reliable.
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