Dust?
I've had my 700 since they were initially available and it comes with me everywhere I go. Since I have it with me now at work, I turned out the lights in my office and put the 700's lights on the highest setting and I still can not see any dust. I have two dogs that shed and I take my 700 on the PATH train & the New York Subway E Line every work day. So at least as far as I can see, environment and use do not seem to be a factor.
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