Sensitivity of Wondfo HcG test strips ?? I got some questions

Moneypenny • Leaving Glow was the best thing I did!
So....I just broke down and ordered a 50 count of Wondfo Pregnancy test strips.  
Does anyone actually know their true sensitivity level?
I looked it up yesterday AFTER I ordered them, just one quick search, and saw 25 miu on one website.
That's disappointing.  
I see a ton of women say they have gotten a positive at only 8 or 9 dpo with these, how "sensitive" they are etc.
How would that be possible with a 25 miu hcg test?  (I only know one way--dates are miscalculated, or ovulated much earlier etc).
So, is it 25 miu or is it more sensitive? Are there other "more sensitive" Wondfo test strips? Did I get the wrong ones?
Now, I DID see some 10miu hcg test strips on Amazon......BUT the reviews weren't as good .  Many women say the 10 miu don't actually pick up any earlier than a 25 miu or Wondfo strip.
Alright my lovely ladies......I know I have a few questions, can u help me answer them please?!!
Thank you!
Here's a picture of my strips I got.....just in case there are more sensitive Wondfo strips. You can see what I have: