Have you ever pulled a SP card from box bought with them? They might all be duds, that's why they are so cheap... Easy profit for them. You better look into case mapping, unless you are happy with SR/RRR then I guess the price is ok.
Yes I have, I wouldn’t recommend them otherwise. I have covered mapping and dead boxes in lots of videos but I do appreciate the concern as many still are not aware of it 😃
