Works great.. I bought 6 of them for England and i was worried about quality since they were so inexpensive. To my surprise they work great. I'm using them in a castle built in the year 1100, with that said not everything is put together the best in here, but none the less the adapters fit and function just fine. My voltage converters slip in and out of them easily, but im not sure if thats because of the converter or the adapter.

Holds the US-side plug tightly so that it doesn't drop out on the wall, like other adapters.

Good product but can't be used with polarized plugs

When I got to the UK, I discovered that the plug of my hair iron didn't fit into the adapter. The Macbook plug did, but what's the use of an adapter if it doesn't accommodate most if not all plugs? I had to go out and buy another, which works with everything. This was a waste of a purchase.