I got the BFP's bf I spent like $100 on Expensive ones and it ended in a chemical pregnancy. So needless to say, I didn't get them in time to test + on them, but I have read mostly positive reviews compared to the Wondfo ones. I never got any evap lines though, and this is just my experience though...some people I have read have good results with the Wondfos, and I can't say what the BFP's are like if you are pg. prolly not a huge help but there's lots of ladies on here with great experience and advice so hopefully you can get some good feedback!