It's okay
When I got my difusers it took a few times to get them working. At first I thought none of them worked. I had ordered three. However, the day after arrival, I tried again and two out of the three worked.
So i guess my next question is how do I get a partial refund?
Other than that I think these things are cool.
My package arrived late but hey, that happens sometimes, not gonna try and blame this company because it's not them personally delivering it.