First ND filter help
I think you'd be better off buying from a more reputable brand. A Tiffen ND 0.9 sells for about $30 on eBay. I own Tiffen ND filters and can say that they cause no perceptible decrease in image quality, while there is a minor blue-green color cast (every ND filter will have a slight color cast, this is among the better ones). I recommend it without hesitation.