Your own Google-fu and reddits's r/whatisthisthing is more useful.
The app does certain things well: if there's text or if the image is a location or reused it finds it very quickly and accurately. It also only goes to the search results page so you have to click through if you want to actually read about it/order it/ etc.
Anything else (identifying cables, faces, misc. household items) goes to a generic image search and more often matches the background patterns than item I am trying to identify. Google is the only search engine which comes up consistently. Of the 5, one only tells you the colors in the photo, one consistently doesn't connect, two are ify on finding a similar image, and one seems to post your own photo to itself so that it can show you various images (I got random sketches the first time and erotic fan art the second, before I deactivated that engine. Not what I wanted to see at all).
There is also no way to edit photos in app. You can take a picture, use a previously taken or saved picture, or even draw the item. So far I have only gotten typographic symbols when I did a drawing search, which is interesting but have nothing to do with what I was trying to find.