Ive got the double bug quite badly, the whole concept seems so 'correct'. I also admit to being an avid trawler, checking out all the models of the different manufacturers and it is always the photograph that appeals first, only then onto all the specs and features. For me, top of the list is the form, it either appeals or, well, not so much. There is that perfect proportion that comes together perfectly like the Heym 87B. Then the action, dead simple plain steel, or adorned with detailed engraving, like the exquisite Westley Richards Forrest Rifle? Scrolls and patterns do nothing for me, animals are better, but honestly plain steel is equally appealing for it's simple clean line. Finally of course the wood, the natural art of it, no two ever identical. Here the guiding principle is taste and balance. The wood mustn't be too ornate for the double wearing it, or it just looks off. Paging through the Explora you see this exemplified perfectly, horses for courses I guess.
So what about a double makes it shine for you?