@Comps83 I’ve just used the CB advance sticks for the first time this month, £26 from boots with 10sticks. I found that my app was completely off with my ovulation. It gave me flashing smileys when I started my fertile window then a static smiley which means you ovulate in the next 12-24hrs. This was on CD18 when I thought it would be CD14!
I’m 7dpo so can let you know soon if they were worth the money haha