That particular unit has an owner's discussion thread
here (click) at avsforum.com,
and continues here (click) at avsforum.com
In brief, there was a manufacturing defect on this particular model which resulted in the screens having some areas darker or lighter than others -- known as "banding". As such this particular model was discounted and also dumped into the discount retailers to clear it out. The Sharp Aquos series is highly regarded if you get one with no problems. But it appears that almost all of this particular model were defective, or Sharp wouldn't have reduced them like they did. The defective "62" line was quickly replaced by the less-defective "64" line.
I love the Sharp Aquos line, but I would not take the risk on this particular one.