So, I bought these tests because the price can't be beat...however, either I got a bad batch or they are really poor quality.They are Clinical Guard, NOT Wondfo (which was recommended to me by my pregnancy forum). It was advertised at Wondfo.I took a test and got a line SO faint, I was holding it up to the light and squinting. Well, I took a first response immediately after and got a DARK line immediately. (With the same urine sample).I went to the doctor that day for an HCG blood test, and my level was 223.1. If this test is sensitive enough to register 25 mIU/L, why was my result SOOOO ambiguous when my levels were 4 times what was necessary to get a positive? I tested 2 days later, with the same faint line (only I swear it was more faint) and HCG was at 400+.Please, just cough up the extra money for the First Response tests...no pregnant woman should have to deal with the stress and uncertainty of these ultra faint "is it or isn't it" results.