Very high quality products!
I bought 40,5 mm 2-400 ND filter. No vinjeting or color shift. Pretty much only ND filter that i am ever going to need on my 16-50 Sony kit lens. Customer service is not easy to deal with but as their engeeners delivers such high quality product (and very well presented in nice white transculent case and you get cleaning clouth to keep it nice and clean) and at very reasonable price i am more then happy! Now they never delivered shotgun microphone that i also ordered due to out of stock and thats why i cant give them 5 stars.