really expensive, but really works and gives unambiguous results unlike the line tests where it's hard to tell if they are the same colour or darker, leading to stress and confusion.
for those who are already stressed about TTC, these are a godsend. they take the guess work away. I will say, take 2 tests a day during your expected fertile window, because I had a negative one morning, then a positive that same afternoon 5 hours later. Also, saving your pee so it's concentrated helps too.