Bests & Worsts Reviews from Amazon

I can't claim to have personally tried every single outlet in Europe, but I can tell you that the majority of European plugs are recessed: that is, the actual socket into which the plug prongs go is set into a little round hole about half an inch deep. This adapter does not fit into that recess, and is therefore useless. I found this out the hard way in both Holland and the Czech Republic, and great was the wailing and lamentation on both occasions. You can use this with an extender built for the purpose (see the Simran Plug Adapter on this site for an example), but if you're doing that, why not just get an adapter that fits in the first place?