After I bought a very expensive filter Stepless regulation of darkening a few months ago and very disappointed sent back, I am yet of this relatively favorable product (compared to others) but surprised quite positive. After brief testing I am very satisfied with the filter and can not find anything negative.
What has surprised me very positively was the very, very fast delivery! Thursday ordered, Saturday it was there. Could not be better.
All in all a very positive impression of the company. And the product!