Mbasko's post is spot on, I can't really add much to that but to say I did really like the Gog's. They have no muffled low mids like the Koss do and a quite bright mid range which is favourable for detector use. They are a touch on the quiet side but this is not a problem as they seem to reveal very subtle target responses. One nugget I picked up last trip I think I surely would have missed without them. They have excellent outside sound rejection such as wind and other noises also, even on very windy days they are quiet and allow you to concentrate on those really subtle responses.
Syndyne really rates the Sennheisers highly also. With either brand you couldn't go wrong.
Syndyne really rates the Sennheisers highly also. With either brand you couldn't go wrong.