I was in Denmark (Aarhus, Kolding, Vejle) last week... a really good GSM coverage but a really bad UMTS service too. The 3G coverage was not really good (3DK has a few cities under direct coverage, too!) and 3G international roaming was impossible with my Wind simcard, but I had the same trouble with other networks (no access with Tim, Vodafone, Orange CH, various Manx and UM). I had 3G roaming on 3DK only with my 3ITA simcard, but I was not able to videocalls and data connections
So I used my "Mega15000" option (the last days
) on 2G Sonofon... what's a pity!