Does anyone have any experience with these tests?

[LittleDarlins]

I bought these wondfo tests to use this cycle and have had 2 pretty convincing evaps today from them but I was speaking to a friend earlier who said she had a batch of counterfeit wondfo's and to make sure they were genuine. This is the first time I've ever used this brand so I wanted to know if anyone has ever used these particular ones, and if so did you get any evaps? After the evaps this morning I took a FRER but I got a BFN. These are blue handle and are the skinny ones.
Thanks