Ive been using this app for several weeks now, and my overall rating is "good." Keeping track of what I eat and etc. is something I was doing via Google sheets before this app, which was nowhere near as accessible as this app. Now, I can note symptoms the moment they pop up, and listing the food I eat is quick and easy.
My only complaint is that the display of data collected in the app is a little confusing and not as multifaceted as I would like.
Overall, I would recommend this app for anyone who is tracking their food related symptoms, in addition to professional medical advise of any dietary conditions they may have.