I really like them too. I've not had any problems with evaps and got the first faint glimmer of a BFP on 9 dpo this last time. Both times I have been pregnant, the Wondfos were clear BFPs on 10 dpo. I also used the opks and got on well with them. At first, I used a digital opk to confirm what I was seeing with the Wondfos and they always agreed.