I didn't use it at all, I bought it as a joke but it didn't suit me and I didn't find any useful purpose for it.

I give it a 4 because it was as expected. It fits perfectly on my phone (Xiaomi Redmi Note 5). The macro lens does its job, the fisheye lens is also nice (it has a black border, but that's part of the effect), and the wide lens does the job, but it has a slightly blurry casing. When I carefully place it on my phone, I don't see any vignette. On my friend's phone (Samsung S9), it barely reaches the lens and appears slightly blurry. If your phone's cameras are positioned high, I believe it's okay for 2 euros.

DO NOT BUY
Useless product for new phones even if you shake it, the result will be a blurry image from the plastic lens holder from a Samsung galaxy s5 mobile phone up to 10.
The same problem in Hawaii with p20 pro and p30 pro, meaning all the lenses are useless and don't do the job. In any category, if you buy it with 2 or 10 lenses and with different lens holders, the result is fake and useless junk. Do not buy them under any circumstances, it's a waste of money from 3.80 up to the 25€ package with all the lenses. Inappropriate. So, a myth has been debunked

A black outline appears constantly on the camera. My phone is the mi 5s, I don't know if it's related, but I'm not very satisfied.

Today the lenses arrived. From first experience, I can say that for the money it has an incredible macro lens. Now, for fish eyes and super wide, I have the only complaint that at the edges of the photo it has black borders which personally doesn't bother me because it gives an artistic perspective to the photo, but it may bother someone else.