Yes, works well for testing end to end web applications. I use testcafe as a platform.
I did both phone screen and office monitor. I found it easier on the office monitor.
For instance, the very last one (find the letter/number in the red dots) I couldn’t see any difference on my phone screen (Galaxy S8). Everything looked the same shade of red. On the monitor I could clearly see the S (I guessed 5 though).
Also, I got 7/10.
I got an 8 out of 10 on my work laptop screen.