The name of this bitters brand literally translates to 'old Danish' and it is a cult product in its native Denmark. Unusually for a 'bitters', this is...
I'd say it's lacking in mouthfeel and aftertaste compared to Angostura for that, but it might be interesting trying to swap half of the Angostura in Angostura-heavy cocktails like Trinidad Sour to see how it fares.
Interesting idea, perhaps i should try it in a Port of Spain cocktail once i get my hands on some good orgeat. And yes, do agree that its inferior in a lot of ways to ango, but i have tried it in a Manhattan once and it wasnt half bad at all.