Has anyone tried? Any pros and cons?
ZWB2 filter
Are you asking about the ZWB2 filter in general? Or the specific one at that link? Because ZWB2 filters have been tested and used a bit around here. Just use the search bar at the top left and search for “ZWB2 filter” to see plenty of results. As for that one particular seller on AliExpress… I dunno. 
There was a kind of group buy for 42mm sized ZWB2 filters as far as I can remember
One thing is they are relative soft compared to hardened glass, so they can be scratched
I’m asking specifically about this one. I know that they were tested and that there was a group buy. But I’m asking if someone ordered from Ali. I remember prices from GB (about 14 :money_mouth_face: and I see what they are on KD (9 :money_mouth_face: and I wonder it is not too cheap.
Looks :sunglasses: to me. They have different sizes, all cheap: Group - Shop Cheap Group from China Group Suppliers at My little grocery Store on Aliexpress.com
Mind that the high prices of ZWB2 filters were always because of the very limited shops offering them, not because of production costs. With KD now selling various sizes for reasonable money that may have caused enough competition to cause these very good prices.