I got two. One of them didn't work.. luckily they provided us with another one in the room we stayed in London and we managed.

Suspicious of poor quality (due to the very low price), I bought two for safety. Both turned out to be useless in the end! Unfortunately, you can't test them in Greece. By the time you reach England, it's already too late. I took the trouble to open one of the two adapters to check its interior. I found that a metal contact was completely missing!

Useless. I went to England and couldn't use my devices with these stupid things. Sometimes you have to pay extra because these were just garbage. I even bought two for safety and both turned out to be useless

Excellent for short trips, but not for continuous use as the European plugs did not fit tightly enough, resulting in frequent disconnections.

I bought 3 (for laptop, mobile phone, e-cigarette battery charger) for a 2-week trip to the UK. One was constantly working, the other 2 were used alternately. Everything was good and I was completely satisfied.

* The asterisk, and the reason why I deduct one star, is because the EU plugs did not fit tightly into the adapter and had some "play". For my use and for the duration of my stay, it didn't bother me at all. But for someone else, it might be important.