The unit is not dirty, what you are looking at is the inside color or the unit since it is 2 toned black and off gray. The dust behind the protective clear tape that the unit was shipped with is just normal dust, i can rip off the tape anytime and dust problem solved.
Allot of bad feed back on Newegg about it? The unit have 4/5 eggs
When looking at reviews on Newegg, its best to read the ones that are "Most helpful"
But then again there are geniuses that do not understand what a "Port multiplier" is, how it works, and for a unit in this price range will not have one build in. Or those who neglect to update their third party USB3 drivers to the latest and wonder why the transfer speed is not fast.
There are so many bad reviews that Sans Digital basically cloned the box and charge more http://www.newegg.com/Product/Product.aspx?Item=N82E16816111203
Then again if the unit have so many bad reviews, and you claim its "pretty dirty" why even make an offer