It’s a very good feedback mechanism for me in my ketogenic journey. It will reinforce your hard work and dedication and let you know if you’ve slipped up. There are very few additional or outside factors that will affect your results unlike other devices. Plus, lots of great content within the app. The only thing the app doesn’t handle well from my perspective is time zone changes. If you test in Tokyo one day and are back in the US the next for a test it will tell you the Tokyo test is in the future and won’t register the result. You can manually input the results easy enough though. I would also like to be able to make a note on a test result which may explain a particular outlier or something like two hours after eating a high fat lunch, etc.