This viewfinder has helped me to take better pictures, it was always hard to capture good angles and frames with just the display and when there is a lot of light. I brought it on a trip and it has been wonderful. I recommend it!
I wasn't sure to buy this viewfinder because I thought that it was a better idea to get the camera EOS M50 (this one has a viewfinder included) but I went to try it to a physical store and its construction didn't look as good as the one as I have now (EOS M3) so I decided to keep this one and get the viewfinder.
By the way, I had to update the firmware in my EOS M3 to be able to use the viewfinder with my camera (it was easy you just have to go to the canon website and you'll find the instructions and software to download it) because when I plugged in it didn't work so after the update it connected automatically.
Pros: - Easier to take pictures with a lot of light
- Focus better frames
- Automatic sensor to display the image in the viewfinder
- It has a button to display image in the viewfinder
- The color matches my camera
Cons: - It's very easy but the only con is that you have to update your firmware.