Well, from my experience I can say that ClearBlue ovulation tests have helped tremendously. I got pregnant from the first month using it. We've been trying for a few months to conceive, but with no luck. This kit is very helpful for those who have irregular cycles to determine when you are ovulating and put you on the right track. The app could use some improvements as the device doesn't connect to the Bluetooth very easy, so it can be a little tricky. The app should have the ability to manually input data. I also got a little confused when, before my peak time, the app said that is not a test day because my body ovulate later. This kit is recommended for those with irregular cycles and it should adjust to everyone's needs for accurate guiding. But I am happy that I got pregnant and I hope this kit will help many others. It worth it.