I have never seen a good one of those.
I tried to get some at work for when people travel and none of them had an earth. All our laptops have an earth connection.
We had 2 users visiting the US without a travel adapter so they went to Home Depot, bought a screwdriver and a 2 pin plug and nearly electrocuted themselves. I asked what they did with the earth and they said that the US doesnt have an earth so they cut it off. They also didnt think of the voltage difference. It is scary what people can cobble together
I took my time, I hurried up, The choice was mine, I didn't think enough