Positives:
It is relatively cheap and fairly easy to use, which was just crucial selling point in the latter. Likewise, a selling point is the excellent workmanship of the filter and its valence.
After the first try I had hingekriegt quite good shots and was also quite excited. Especially with the small extension factors (starting at ND 2) I found the results surprisingly good (see:).
Above all, it did to me when it comes to ND filter which great blurring effects of the water.
Negatives:
This brings me then already one of the negative aspects that have been at an adjustable neutral density filter, and why I will continue to rely more on a set of normal density filter, the fact ending that, as with all graduated filters of this kind at the high extension factors (in this case is at ND400) in mild sunlight unsightly dark-light effects are created which the image mood lasting tarnish (See:).
One has to look for shady areas, where there is very little sunlight and possibly edit the images according therefore perforce. (See:)
All in all, I'm quite happy, even though I will continue to buy me more, the neutral density filter as single set.