I've been using this "scanner" for just short of a year now and I can say it is really poor. Whether you are scanning negatives or slides they are simply not illuminated enough by the LEDS for a decent scan. The processing software also seems to alter the colours as well.
As for the Arcsoft Photo Impression software that is bundled, all i can say is awful.
You may get the odd scan that turns out as it actually should, but save your money and invest in a quality product, which this most certainly is not.